Errors after update to reportlab 3.0

Hello

I have a larger script that fails with 3.0. I hope one of you maybe 
recognizes on a first glance the problem in the error mesage so I'll 
just attach it here.

It is quiet a lot of code so it would take me some hours to reduce it to 
a version that would be comsumable for you. I will of course do it if 
neccessary but if one of you would save me the time that would be really 
great.

Thanks in advance for any hint, T.



Traceback (most recent call last):
   File "./pdf_document.py", line 212, in <module>
     print(PdfWriter().write_pdf())
   File "./pdf_document.py", line 188, in write_pdf
     self.doc.multiBuild(self.story)
   File "/home/thelonius/git/qtsummenbogen/pdf_doku_template.py", line 
33, in multiBuild
     BaseDocTemplate.multiBuild(self,flowables, canvasmaker=canvasmaker)
   File 
"/usr/lib/python3.4/site-packages/reportlab/platypus/doctemplate.py", 
line 980, in multiBuild
     self.canv.save()
   File "/usr/lib/python3.4/site-packages/reportlab/pdfgen/canvas.py", 
line 1209, in save
     self._doc.SaveToFile(self._filename, self)
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 217, in SaveToFile
     data = self.GetPDFData(canvas)
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 242, in GetPDFData
     return self.format()
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 421, in format
     IOf = IO.format(self)
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 864, in format
     fcontent = format(self.content, document, toplevel=1)   # yes this 
is at top level
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 78, in format
     f = element.format(document)
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 1595, in format
     return D.format(document)
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 671, in format
     L = [(format(PDFName(k),document)+b" "+format(dict[k],document)) 
for k in keys]
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 671, in <listcomp>
     L = [(format(PDFName(k),document)+b" "+format(dict[k],document)) 
for k in keys]
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 78, in format
     f = element.format(document)
   File "/usr/lib/python3.4/site-packages/reportlab/pdfbase/pdfdoc.py", 
line 1771, in format
     if f is None: raise ValueError("format not resolved %s" % self.name)
ValueError: format not resolved f5