# Action Failed: Could not interpret MSTest results
**URL:** https://www.finalbuilder.com/forums/t/action-failed-could-not-interpret-mstest-results/3366
**Category:** Bugs
**Created:** [June 1, 2011, 2:16am UTC](https://www.finalbuilder.com/forums/t/action-failed-could-not-interpret-mstest-results/3366 "2011-06-01T02:16:32Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@tedgr](https://www.finalbuilder.com/forums/u/tedgr)
#### Post date: [June 1, 2011, 2:16am UTC](https://www.finalbuilder.com/forums/t/action-failed-could-not-interpret-mstest-results/3366/1 "2011-06-01T02:16:32Z")
I am running builds using FinalBuilder 7 (7.0.0.1065) on a Windows Server 2003 machine.
My builds are randomly failing on an MSTest action running tests on Visual Studio.NET 2010
I am getting intermittent, random build failures where all the MSTest unit tests pass, but the action fails with the following error message:
Summary
-------
Test Run Completed.
Passed 166
-----------
Total 166
Results file: D:\AB\TMK\_Main\TFS\TMK\TopMarketer\TMK\_a.1\_Main\SOURCE CODE\BusinessLogic\TMKPro\TMKProTestProject\bin\Release\TMKProTestProject.dll.trx
Test Settings: Default Test Settings
Could not interpret MSTest results: Could not convert variant of type (Null) into type (OleStr)
MSTest test results file: D:\AB\TMK\_Main\TFS\TMK\TopMarketer\TMK\_a.1\_Main\SOURCE CODE\BusinessLogic\TMKPro\TMKProTestProject\bin\Release\TMKProTestProject.dll.trx
Action Failed
C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\MSTest.exe returned : 0
---
### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [June 1, 2011, 3:05am UTC](https://www.finalbuilder.com/forums/t/action-failed-could-not-interpret-mstest-results/3366/2 "2011-06-01T03:05:26Z")
Hi Ted
Could you send us (to support at finalbuilder dot com )the TMKProTestProject.dll.trx file so we can test it under a debugger and see what is happening?