# FB 5 Error dialog on initialization
**URL:** https://www.finalbuilder.com/forums/t/fb-5-error-dialog-on-initialization/2997
**Category:** Bugs
**Created:** [June 24, 2008, 2:12am UTC](https://www.finalbuilder.com/forums/t/fb-5-error-dialog-on-initialization/2997 "2008-06-24T02:12:08Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@abell](https://www.finalbuilder.com/forums/u/abell)
#### Post date: [June 24, 2008, 2:12am UTC](https://www.finalbuilder.com/forums/t/fb-5-error-dialog-on-initialization/2997/1 "2008-06-24T02:12:08Z")
Hi,
I am running FB Version 5.5.0.707 on Vista 64.
VS 2008 and .Net 3.5 installed.
On initializaton the following dialog appears:
#####
FinalBuilder5.exe - .NET Framework Initialization Error
To run this application, you first must install one of the following
— versions of the .NET Framework:
v3.5
Contact your application publisher for instructions about obtaining the appropriate version of the NET Framework.
#######
When I click OK intialization continues and all seems OK.
.Net 3.5 is installed.
Regards
Andy B
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### Author:  [@angus](https://www.finalbuilder.com/forums/u/angus)
#### Post date: [June 24, 2008, 2:38am UTC](https://www.finalbuilder.com/forums/t/fb-5-error-dialog-on-initialization/2997/2 "2008-06-24T02:38:45Z")
Hi Andrew,
Thanks for posting. This is a known issue with this version of FB 5.5. If you go Tools -\> Options -\> .NET -\> CLR Hosting and change the hosted CLR version to “v2.0”, the issue will go away. This will not prevent from using MSBuild 3.5, VS 2008 or any other Framework 3.5 utilities.
Sorry for the inconvenience.
Regards,
Angus
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### Author:  [@abell](https://www.finalbuilder.com/forums/u/abell)
#### Post date: [June 24, 2008, 3:00am UTC](https://www.finalbuilder.com/forums/t/fb-5-error-dialog-on-initialization/2997/3 "2008-06-24T03:00:18Z")
Thanks Angus
That works.