Object reference not set to an instance of an object error when executing test from grid

Question

I am executing test from a grid. I am using Nugridium.

For some test I get the following error:

. Exception: Object reference not set to an instance of an object.. Stack trace:    at AgentAndVExecutorModels.Providers.TestRunnerService.NunitTestRunnerService.ExecuteNUnitTest(Test test, String binariesDir, StringBuilder& testOutputLog, Int32& nUnitVer)

at NUnitGridSpoonBrowserVirtualTestExecutor.Program.pAe3PrNCc(String[] )

When I run the same test from VS the test go fine.

Can anyone explain this error to me and how I should fix this?