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Q189499: FIX: VB5.EXE Application Error with UserControls in Project

Article: Q189499
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:5.0
Operating System(s): 
Keyword(s): kbGrpDSVB
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, version 5.0 
- Microsoft Visual Basic Professional Edition for Windows, version 5.0 
- Microsoft Visual Basic Enterprise Edition for Windows, version 5.0 
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SYMPTOMS
========

Large projects or project groups that contain UserControls that are not compiled
OCXs may experience the following application error:

  The instruction at "0x0fbb54bb" referenced memory at "0x00000000". The memory
  could not be "read".

This behavior occurs when either compiling the project or opening a form that may
contain a UserControl.

CAUSE
=====

The UserControls contain either references to global objects or circular
references to Forms/Modules within the project.

RESOLUTION
==========

There are three possible resolutions to this issue:

- Select Options from the Tools menu, select the General tab, and then deselect
  Background Compile.

- Use compiled OCXs in the project instead of having a UserControl project as
  part of the Project Group.

- Late bind global object references within UserControls and attach them to
  instances at run-time.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug has been corrected in Visual Basic version
6.0.

Additional query words: kbDSupport kbCrtl kbVBp500bug kbdss kbVBp kbVBp600fix

======================================================================
Keywords          : kbGrpDSVB 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVBA500 kbVB500
Version           : WINDOWS:5.0
Issue type        : kbbug
Solution Type     : kbfix

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