# Empty Warning box
**URL:** https://www.finalbuilder.com/forums/t/empty-warning-box/1851
**Category:** Discussion
**Created:** [September 8, 2011, 9:29am UTC](https://www.finalbuilder.com/forums/t/empty-warning-box/1851 "2011-09-08T09:29:20Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@deleted\_user](https://www.finalbuilder.com/forums/u/deleted_user)
#### Post date: [September 8, 2011, 9:29am UTC](https://www.finalbuilder.com/forums/t/empty-warning-box/1851/1 "2011-09-08T09:29:20Z")
Hi, when selecting the .vcproj file for a MSBuild action, a empty warning box always pops up.
The same happens when the properties page for this MSBuild is opened when the vcproj file is set.
The action builds successfully.
Can I find the actual error somewhere in the log files?
//Chrille
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### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [September 8, 2011, 11:19am UTC](https://www.finalbuilder.com/forums/t/empty-warning-box/1851/2 "2011-09-08T11:19:19Z")
I suspect this has to do with the version .net used by the project not being the same as the clr version hosted by FinalBuilder. What version of vc is the vcproj from and which version of .NET is FinalBuilder loading (Tools\Options\[FinalBuilder.NET](http://FinalBuilder.NET) Framework version)?
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### Author:  [@deleted\_user](https://www.finalbuilder.com/forums/u/deleted_user)
#### Post date: [September 8, 2011, 11:28am UTC](https://www.finalbuilder.com/forums/t/empty-warning-box/1851/3 "2011-09-08T11:28:23Z")
Hi, thanks for the quick reply! The project is .net 3.5 and FB is set to 4.0, changing FB to 3.5 fixed the problem!
Thanks!
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### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [September 8, 2011, 12:12pm UTC](https://www.finalbuilder.com/forums/t/empty-warning-box/1851/4 "2011-09-08T12:12:00Z")
Ok thanks for letting us know. This is a bit of an issue is we can really only host one version of the .net framework at a time.