Assertion failed at line 201 of file "cpanel.c"

Error Message

The following error occurs when opening a project in ArcView . . .Assertion "LIST_Count(self->ResBoxes)== LIST_Count(self->Children)" failed at line 201 of file "cpanel.c"

Cause

The project has been saved with the 3d_point_of_view.avx extension turned on. This is a third party extension that adds corrupt elements to the project file.

Solution or Workaround

1. Select Start>Find>Find Files or Folders . . .
2. Search all local drives for a file named 3D_point_of_view.avx.
3. Rename it to 3D_point_of_view.old.
4. Make a back up copy of the APR file.
5. Open the APR in a text editor such as WordPad or NotePad.
6. Search for the text "Prefs:". You should find a line that looks like the following. The number may be different.
   
   

        Prefs: 11

   
   
7. Add an REM to the beginning of this line and save the file. The line should now look like the following.
   
   

   REM  Prefs: 11

   
   
8. Open the APR file in ArcView.
9. Click Cancel when asked "Where is . . . 3D_point_of_view.avx?"
10. Save the project.
    
    

    Warning:
     Do not turn on this extension again.