Error when run from GUI but not command line

[dmeans]

My VBP project is failing on the build of a VB.NET 2003 project, but only when I run my .bld file from the VBP GUI application (VisBuildPro.exe).

I can compile the VB project in Visual Studio. I can even compile it from a command prompt using the command line that VisBuildPro.exe is trying to use. Stranger still, when I run my .bld file from the VBP command line application (VisBuildCmd.exe), it works fine. It only seems to fail when I use the GUI (stepping though it manually or called from a sheduled task using VisBuildPro.exe /b).

Any ideas?

Here is the output generated from the GUI app:

2/22/2006 10:04:09 AM: Building project step 'Build Data Service 2003'...
Pre-processing...

Rebuilding configuration 'Release'...
Command: "C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\IDE\devenv.com" C:\Develop\DataService2003\DataService2003.sln /rebuild Release

Microsoft (R) Development Environment Version 7.10.3077.
Copyright (C) Microsoft Corp 1984-2001. All rights reserved.
------ Rebuild All started: Project: DataService2003, Configuration: Release .NET ------

Preparing resources...
Updating references...
Performing main compilation...
vbc : error BC30145: Unable to emit assembly: Unexpected exception processing attribute -- System.ArgumentException: Unable to generate permission set; input XML may be malformed..
Building satellite assemblies...
Satellite assemblies could not be built because the main project output is missing.


---------------------- Done ----------------------

Rebuild All: 0 succeeded, 1 failed, 0 skipped