any idea what this error is about?

ERROR : An internal error occurred while generating code
An unexpected error occurred!

Date and time: 2016-02-06T14:19:06.704222
Python version: 2.7.9
wxPython version: 3.0.1.1
wxWidgets platform: __WXGTK__
wxGlade version: 0.7.0
Language code: en_US
Encoding: UTF-8
Filesystem encoding: UTF-8

Exception type: <type 'exceptions.AssertionError'>
Exception details:
Application stack trace:
Stack frame at level 0
======================
File "/usr/lib/python2.7/dist-packages/wxglade/wcodegen/__init__.py", line 755
Function "get_layout_code(self=<menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>, obj=<xml_parse.CodeObject object at 0x7f7a1dddacd0>)"
Source code context:
@see: L{tmpl_props}
@rtype: list[str]
"""
-> assert self.tmpl_layout
layout_lines = []
self._reset_vars()

Local variables:
-> self (<class 'menubar.codegen.PythonMenubarGenerator'>): <menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>
-> obj (<class 'xml_parse.CodeObject'>): <xml_parse.CodeObject object at 0x7f7a1dddacd0>

Stack frame at level 1
======================
File "/usr/lib/python2.7/dist-packages/wxglade/codegen/__init__.py", line 1843
Function "generate_code_do_layout(self=<py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>, builder=<menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>, code_obj=<xml_parse.CodeObject object at 0x7f7a1dddacd0>, is_new=True, tab='\t\t\t\t\t\t\t\t')"
Source code context:

# check if there are extra layout lines to add
if hasattr(builder, 'get_layout_code'):
-> extra_layout_lines = builder.get_layout_code(code_obj)
else:
extra_layout_lines = []

Local variables:
-> builder (<class 'menubar.codegen.PythonMenubarGenerator'>): <menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>
-> is_new (<type 'bool'>): True
-> code_lines (<type 'list'>): []
-> write (<type 'builtin_function_or_method'>): <built-in method append of list object at 0x7f7a2499ccb0>
-> code_obj (<class 'xml_parse.CodeObject'>): <xml_parse.CodeObject object at 0x7f7a1dddacd0>
-> sizers_init_lines (<type 'list'>): []
-> tab (<type 'str'>): '\t\t\t\t\t\t\t\t'
-> self (<class 'py_codegen.PythonCodeWriter'>): <py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>
-> layout_lines (<type 'list'>): []

Stack frame at level 2
======================
File "/usr/lib/python2.7/dist-packages/wxglade/codegen/py_codegen.py", line 460
Function "generate_code_do_layout(self=<py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>, builder=<menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>, code_obj=<xml_parse.CodeObject object at 0x7f7a1dddacd0>, is_new=True, tab='\t\t\t\t\t\t\t\t')"
Source code context:
builder,
code_obj,
is_new,
-> tab,
)

def generate_code_event_bind(self, code_obj, tab, event_handlers):
Local variables:
-> code_obj (<class 'xml_parse.CodeObject'>): <xml_parse.CodeObject object at 0x7f7a1dddacd0>
-> builder (<class 'menubar.codegen.PythonMenubarGenerator'>): <menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>
-> is_new (<type 'bool'>): True
-> tab (<type 'str'>): '\t\t\t\t\t\t\t\t'
-> self (<class 'py_codegen.PythonCodeWriter'>): <py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>

Stack frame at level 3
======================
File "/usr/lib/python2.7/dist-packages/wxglade/codegen/__init__.py", line 1359
Function "add_class(self=<py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>, code_obj=<xml_parse.CodeObject object at 0x7f7a1dddacd0>)"
Source code context:
builder,
code_obj,
is_new,
-> tab
)
obuffer.extend(code_lines)

Local variables:
-> indentation (<type 'str'>): '\t\t\t\t\t\t\t\t'
-> mods (<type 'list'>): []
-> obuffer (<type 'list'>): ['\nclass MenuBar(wx.MenuBar):\n',
'\t\t\t\tdef __init__(self, *args, **kwds):\n',
'\t\t\t\t\t\t\t\t# begin wxGlade: MenuBar.__init__\n',
'\t\t\t\t\t\t\t\twx.MenuBar.__init__(self, *args, **kwds)\n',
'\n\t\t\t\t\t\t\t\tself.__set_properties()\n\t\t\t\t\t\t\t\tself.__do_layout()\n',
'\t\t\t\t\t\t\t\t# end wxGlade\n',
'\n',
'\t\t\t\tdef __set_properties(self):\n',
'\t\t\t\t\t\t\t\t# begin wxGlade: MenuBar.__set_properties\n',
'\t\t\t\t\t\t\t\tpass\n',
'\t\t\t\t\t\t\t\t# end wxGlade\n',
'']
-> mycn (<type 'instancemethod'>): <bound method PythonMenubarGenerator.cn of <menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>>
-> prev_src (<type 'NoneType'>): None
-> builder (<class 'menubar.codegen.PythonMenubarGenerator'>): <menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>
-> extra_code (<type 'str'>): ''
-> code_lines (<type 'list'>): ['\n',
'\t\t\t\tdef __set_properties(self):\n',
'\t\t\t\t\t\t\t\t# begin wxGlade: MenuBar.__set_properties\n',
'\t\t\t\t\t\t\t\tpass\n',
'\t\t\t\t\t\t\t\t# end wxGlade\n',
'']
-> is_new (<type 'bool'>): True
-> write (<type 'builtin_function_or_method'>): <built-in method append of list object at 0x7f7a2499cb48>
-> code_obj (<class 'xml_parse.CodeObject'>): <xml_parse.CodeObject object at 0x7f7a1dddacd0>
-> mycn_f (<type 'instancemethod'>): <bound method PythonMenubarGenerator.cn_f of <menubar.codegen.PythonMenubarGenerator object at 0x7f7a26dfe350>>
-> tab (<type 'str'>): '\t\t\t\t\t\t\t\t'
-> filename (<type 'str'>): '/home/layer2/PyCharm_Projects/DMZ/2dViewer/MenuBar.py'
-> self (<class 'py_codegen.PythonCodeWriter'>): <py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>
-> event_handlers (<type 'list'>): []

Stack frame at level 4
======================
File "/usr/lib/python2.7/dist-packages/wxglade/xml_parse.py", line 816
Function "endElement(self=<xml_parse.CodeWriter instance at 0x7f7a24996f38>, name=u'object')"
Source code context:
# to its toplevel parent, or to generate the code for the custom
# class
if obj.is_toplevel and not obj.in_sizers:
-> self.code_writer.add_class(obj)
topl = self._toplevels.top()
if topl:
self.code_writer.add_object(topl, obj)
Local variables:
-> self (<type 'instance'>): <xml_parse.CodeWriter instance at 0x7f7a24996f38>
-> obj (<class 'xml_parse.CodeObject'>): <xml_parse.CodeObject object at 0x7f7a1dddacd0>
-> name (<type 'unicode'>): u'object'

Stack frame at level 5
======================
File "/usr/lib/python2.7/xml/sax/expatreader.py", line 307
Function "end_element(self=<xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>, name=u'object')"
Source code context:
self._cont_handler.startElement(name, AttributesImpl(attrs))

def end_element(self, name):
-> self._cont_handler.endElement(name)

def start_element_ns(self, name, attrs):
pair = name.split()
Local variables:
-> self (<type 'instance'>): <xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>
-> name (<type 'unicode'>): u'object'

Stack frame at level 6
======================
File "/usr/lib/python2.7/xml/sax/expatreader.py", line 210
Function "feed(self=<xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>, data='<?xml version="1.0"?>\n<!-- generated by wxGlade 0.7.0 on Sat Feb 6 14:19:06 2016 -->\n\n<application path="/home/layer2/PyCharm_Projects/DMZ/2dViewer" name="app" class="MyApp" option="1" language="python" top_window="frame_1" encoding="UTF-8" use_gettext="1" overwrite="1" use_new_namespace="1" for_version="3.0" is_template="0" indent_amount="4" indent_symbol="tab" source_extension=".cpp" header_extension=".h">\n <object class="MenuBar" name="menubar" base="EditMenuBar">\n <menus>\n </menus>\n </object>\n <object class="MyFrame" name="frame_1" base="EditFrame">\n <title>frame_1</title>\n <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">\n <orient>wxVERTICAL</orient>\n <object class="sizerslot" />\n </object>\n </object>\n</application>\n', isFinal=0)"
Source code context:
# If it is set to true, expat will check validity of the entire
# document. When feeding chunks, they are not normally final -
# except when invoked from close.
-> self._parser.Parse(data, isFinal)
except expat.error, e:
exc = SAXParseException(expat.ErrorString(e.code), e, self)
# FIXME: when to invoke error()?
Local variables:
-> self (<type 'instance'>): <xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>
-> data (<type 'str'>): '<?xml version="1.0"?>\n<!-- generated by wxGlade 0.7.0 on Sat Feb 6 14:19:06 2016 -->\n\n<application path="/home/layer2/PyCharm_Projects/DMZ/2dViewer" name="app" class="MyApp" option="1" language="python" top_window="frame_1" encoding="UTF-8" use_gettext="1" overwrite="1" use_new_namespace="1" for_version="3.0" is_template="0" indent_amount="4" indent_symbol="tab" source_extension=".cpp" header_extension=".h">\n <object class="MenuBar" name="menubar" base="EditMenuBar">\n <menus>\n </menus>\n </object>\n <object class="MyFrame" name="frame_1" base="EditFrame">\n <title>frame_1</title>\n <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">\n <orient>wxVERTICAL</orient>\n <object class="sizerslot" />\n </object>\n </object>\n</application>\n'
-> isFinal (<type 'int'>): 0

Stack frame at level 7
======================
File "/usr/lib/python2.7/xml/sax/xmlreader.py", line 123
Function "parse(self=<xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>, source=<xml.sax.xmlreader.InputSource instance at 0x7f7a2499cef0>)"
Source code context:
file = source.getByteStream()
buffer = file.read(self._bufsize)
while buffer != "":
-> self.feed(buffer)
buffer = file.read(self._bufsize)
self.close()

Local variables:
-> buffer (<type 'str'>): '<?xml version="1.0"?>\n<!-- generated by wxGlade 0.7.0 on Sat Feb 6 14:19:06 2016 -->\n\n<application path="/home/layer2/PyCharm_Projects/DMZ/2dViewer" name="app" class="MyApp" option="1" language="python" top_window="frame_1" encoding="UTF-8" use_gettext="1" overwrite="1" use_new_namespace="1" for_version="3.0" is_template="0" indent_amount="4" indent_symbol="tab" source_extension=".cpp" header_extension=".h">\n <object class="MenuBar" name="menubar" base="EditMenuBar">\n <menus>\n </menus>\n </object>\n <object class="MyFrame" name="frame_1" base="EditFrame">\n <title>frame_1</title>\n <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">\n <orient>wxVERTICAL</orient>\n <object class="sizerslot" />\n </object>\n </object>\n</application>\n'
-> source (<type 'instance'>): <xml.sax.xmlreader.InputSource instance at 0x7f7a2499cef0>
-> self (<type 'instance'>): <xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>
-> file (<type 'instance'>): <StringIO.StringIO instance at 0x7f7a2499cd88>
-> saxutils (<type 'module'>): <module 'xml.sax.saxutils' from '/usr/lib/python2.7/xml/sax/saxutils.pyc'>

Stack frame at level 8
======================
File "/usr/lib/python2.7/xml/sax/expatreader.py", line 107
Function "parse(self=<xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>, source=<xml.sax.xmlreader.InputSource instance at 0x7f7a2499cef0>)"
Source code context:
self._source = source
self.reset()
self._cont_handler.setDocumentLocator(ExpatLocator(self))
-> xmlreader.IncrementalParser.parse(self, source)

def prepareParser(self, source):
if source.getSystemId() is not None:
Local variables:
-> source (<type 'instance'>): <xml.sax.xmlreader.InputSource instance at 0x7f7a2499cef0>
-> self (<type 'instance'>): <xml.sax.expatreader.ExpatParser instance at 0x7f7a24996e18>

Stack frame at level 9
======================
File "/usr/lib/python2.7/dist-packages/wxglade/xml_parse.py", line 100
Function "parse_string(self=<xml_parse.CodeWriter instance at 0x7f7a24996f38>, source=<StringIO.StringIO instance at 0x7f7a2499cd88>)"
Source code context:

def parse_string(self, source):
source = StringIO.StringIO(source)
-> self.parser.parse(source)
source.close()

def setDocumentLocator(self, locator):
Local variables:
-> source (<type 'instance'>): <StringIO.StringIO instance at 0x7f7a2499cd88>
-> self (<type 'instance'>): <xml_parse.CodeWriter instance at 0x7f7a24996f38>

Stack frame at level 10
=======================
File "/usr/lib/python2.7/dist-packages/wxglade/xml_parse.py", line 683
Function "__init__(self=<xml_parse.CodeWriter instance at 0x7f7a24996f38>, writer=<py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>, input='<?xml version="1.0"?>\n<!-- generated by wxGlade 0.7.0 on Sat Feb 6 14:19:06 2016 -->\n\n<application path="/home/layer2/PyCharm_Projects/DMZ/2dViewer" name="app" class="MyApp" option="1" language="python" top_window="frame_1" encoding="UTF-8" use_gettext="1" overwrite="1" use_new_namespace="1" for_version="3.0" is_template="0" indent_amount="4" indent_symbol="tab" source_extension=".cpp" header_extension=".h">\n <object class="MenuBar" name="menubar" base="EditMenuBar">\n <menus>\n </menus>\n </object>\n <object class="MyFrame" name="frame_1" base="EditFrame">\n <title>frame_1</title>\n <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">\n <orient>wxVERTICAL</orient>\n <object class="sizerslot" />\n </object>\n </object>\n</application>\n', from_string=True, out_path=None, preview=False, class_names=set(['wxBoxSizer', u'MyFrame', u'MenuBar']))"
Source code context:
self.class_names = set()

if from_string:
-> self.parse_string(input)
else:
inputfile = None
try:
Local variables:
-> preview (<type 'bool'>): False
-> out_path (<type 'NoneType'>): None
-> self (<type 'instance'>): <xml_parse.CodeWriter instance at 0x7f7a24996f38>
-> writer (<class 'py_codegen.PythonCodeWriter'>): <py_codegen.PythonCodeWriter object at 0x7f7a271ef1d0>
-> input (<type 'str'>): '<?xml version="1.0"?>\n<!-- generated by wxGlade 0.7.0 on Sat Feb 6 14:19:06 2016 -->\n\n<application path="/home/layer2/PyCharm_Projects/DMZ/2dViewer" name="app" class="MyApp" option="1" language="python" top_window="frame_1" encoding="UTF-8" use_gettext="1" overwrite="1" use_new_namespace="1" for_version="3.0" is_template="0" indent_amount="4" indent_symbol="tab" source_extension=".cpp" header_extension=".h">\n <object class="MenuBar" name="menubar" base="EditMenuBar">\n <menus>\n </menus>\n </object>\n <object class="MyFrame" name="frame_1" base="EditFrame">\n <title>frame_1</title>\n <object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">\n <orient>wxVERTICAL</orient>\n <object class="sizerslot" />\n </object>\n </object>\n</application>\n'
-> from_string (<type 'bool'>): True
-> class_names (<type 'set'>): set([u'MenuBar', u'MyFrame', 'wxBoxSizer'])

Stack frame at level 11
=======================
File "/usr/lib/python2.7/dist-packages/wxglade/application.py", line 721
Function "generate_code(self=<application.Application object at 0x7f7a26d3a890>, *args=(<wx._core.CommandEvent; proxy of <Swig Object of type 'wxCommandEvent *' at 0x7ffc82686070> >,), **kwds={})"
Source code context:
out.getvalue(), True,
preview=preview,
out_path=out_path,
-> class_names=class_names,
)
if preview and cw == 'python':
self.overwrite = overwrite
Local variables:
-> kwds (<type 'dict'>): {}
-> out_path (<type 'NoneType'>): None
-> self (<class 'application.Application'>): <application.Application object at 0x7f7a26d3a890>
-> args (<type 'tuple'>): (<wx._core.CommandEvent; proxy of <Swig Object of type 'wxCommandEvent *' at 0x7ffc82686070> >,)
-> inst (<type 'exceptions.AssertionError'>): AssertionError()
-> dialog (<class 'bugdialog.BugReport'>): <bugdialog.BugReport; proxy of <Swig Object of type 'wxDialog *' at 0x1a2b9e0> >
-> CodeWriter (<type 'classobj'>): <class xml_parse.CodeWriter at 0x7f7a29d34e20>
-> preview (<type 'bool'>): False
-> cw (<type 'str'>): 'python'
-> class_names (<type 'set'>): set([u'MenuBar', u'MyFrame', 'wxBoxSizer'])
-> out (<class 'misc.UnicodeStringIO'>): <misc.UnicodeStringIO object at 0x7f7a249ac390>

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