Error: Index was outside the bounds of the array. while using MStest runner task.

[vijeta sah]

I am using Visual Studio 2017 and am able to build the project using a MSbuild task. When I create a MStest runner task to run the unit tests, I get the error.

Loading SelfHostWebapi2.0\ApiProject\bin\Debug\Test.dll...

SelfHostWebapi2.0\ApiProject\bin\Debug\Test.dll

Index was outside the bounds of the array.

I checked and the Test.dll file is present at the location. 

Can someone please help? I am using only a MStest runner task and no MStest parser task, is that needed in this case?

I get the same error when I try to run the mstest using command line.

P.S. : VStest task runs fine to run the unit tests but I need to get MStest runner to work for a project requirement.