# Could not interpret MSTest results
**URL:** https://www.finalbuilder.com/forums/t/could-not-interpret-mstest-results/3248
**Category:** Bugs
**Created:** [July 20, 2010, 10:04am UTC](https://www.finalbuilder.com/forums/t/could-not-interpret-mstest-results/3248 "2010-07-20T10:04:08Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@karmasponge](https://www.finalbuilder.com/forums/u/karmasponge)
#### Post date: [July 20, 2010, 10:04am UTC](https://www.finalbuilder.com/forums/t/could-not-interpret-mstest-results/3248/1 "2010-07-20T10:04:08Z")
I'm currently evaluating FinalBuilder 6 and FinalBuilder 6 Server on windows 7.
I'm running into a random failure running tests assemblies through mstest (VS2010).
We occasionally receive the error message:
Could not interpret MSTest results: Could not convert variant of type (Null) into type (String)
All tests succeeded but this results in the action failing and therefore the build.
Has anyone encounted this? Are there known issues with mstest in some/any circumstances?
Thx!
[TestResults.xml](https://www.finalbuilder.com/forums/uploads/default/original/2X/8/8a9030752d634cdde2c353c811655662e5f315f4.xml) (86.321 KB)
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### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [July 20, 2010, 11:38am UTC](https://www.finalbuilder.com/forums/t/could-not-interpret-mstest-results/3248/2 "2010-07-20T11:38:40Z")
This sounds like a bug in the action, we’ll check it out.
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### Author:  [@karmasponge](https://www.finalbuilder.com/forums/u/karmasponge)
#### Post date: [August 31, 2010, 1:20am UTC](https://www.finalbuilder.com/forums/t/could-not-interpret-mstest-results/3248/3 "2010-08-31T01:20:06Z")
Hi,
Whatever this was does not happen in version 7.
Awesome, thanks!