Error loading projects: eieio-persistent-validate/fix-slot-value: Wrong type argument: arrayp, nil

I am getting this error when I try to load a project.
I'm using Emacs 24.3.1 and the built-in version of CEDET.

Here's the backtrace:

Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
   child-of-class-p(ede-proj-target-makefile-program ede-target)
   eieio-persistent-validate/fix-slot-value(ede-proj-project :targets 
(list (ede-proj-target-makefile-program "first" :name "first" :path "" 
:source (quote ("test.cpp")))))
   eieio-persistent-convert-list-to-object((ede-proj-project "test" 
:file "Project.ede" :name "test" :targets (list 
(ede-proj-target-makefile-program "first" :name "first" :path "" :source 
(quote ("test.cpp")))) :makefile-type (quote Makefile\.am)))
   eieio-persistent-read("/home/zach/projects/test/Project.ede" 
ede-proj-project)
   ede-proj-load("/home/zach/projects/test/")
   #[(this dir) "\30\304\"\204\305 !\204\306\307!\210\30\310\"     
!\211\204 \306\311!\210\312\n!)\207" [this dir o eieio-oref :safe-p 
ede-directory-safe-p error "Attempt to load an unsafe project (bug 
elsewhere in EDE)" load-type "Project type error: :load-type failed to 
create a project" ede-add-project-to-global-list] 4 "Load in the project 
associated with THIS project autoload description.\nTHIS project 
description should be valid for DIR, where the project will\nbe 
loaded."]([object ede-project-autoload "edeproject-makefile" "Make" 
ede/proj "Project.ede" "" unbound nil ede-proj-load ede-proj-project nil 
t nil] "/home/zach/projects/test/")
   apply(#[(this dir) "\30\304\"\204\305 !\204\306\307!\210\30\310\"     
!\211\204 \306\311!\210\312\n!)\207" [this dir o eieio-oref :safe-p 
ede-directory-safe-p error "Attempt to load an unsafe project (bug 
elsewhere in EDE)" load-type "Project type error: :load-type failed to 
create a project" ede-add-project-to-global-list] 4 "Load in the project 
associated with THIS project autoload description.\nTHIS project 
description should be valid for DIR, where the project will\nbe 
loaded."] ([object ede-project-autoload "edeproject-makefile" "Make" 
ede/proj "Project.ede" "" unbound nil ede-proj-load ede-proj-project nil 
t nil] "/home/zach/projects/test/"))
   ede-auto-load-project([object ede-project-autoload 
"edeproject-makefile" "Make" ede/proj "Project.ede" "" unbound nil 
ede-proj-load ede-proj-project nil t nil] "/home/zach/projects/test/")
   ede-load-project-file("/home/zach/projects/test/" ROOT)
   ede-initialize-state-current-buffer()
   ede-minor-mode(1)
   ede-turn-on-hook()
   run-hooks(find-file-hook)
   after-find-file(nil t)
   find-file-noselect-1(#<buffer test.cpp> "~/projects/test/test.cpp" 
nil nil "~/projects/test/test.cpp" (53478316 2050))
   find-file-noselect("~/projects/test/test.cpp" nil nil t)
   find-file("~/projects/test/test.cpp" t)
   call-interactively(find-file nil nil)

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