See https://stackoverflow.com/questions/12159/how-should-i-unit-test-multithreaded-code
You need to try and redesign the code better, but it might be tricky.
It's best to do an internet search for that error message as it's quite common. See e.g. https://stackoverflow.com/questions/9732709/the-calling-thread-cannot-access-this-object-because-a-different-thread-owns-it. Hopefully it should give you an answer.
rraghvani , I did internet search. But the problem is that I am using TestComplete to do unit testing on a desktop application in which I cannot edit the functions inside the application. I am trying to do unit testing on functions which involve multiple threads. And I am using TCUnitTest to call the functions inside the application.
