Getting a runtime error when running the test project

I was running a test project which did execute without any problems. Then I added 2 extra DLLs and wrote some code as well. After that I got the below specified run time error. Though I removed those DLLs and new code still it doesn't run. This was running fine though. Please advice.

Warning: Test Run deployment issue: The assembly or module 'Npgsql' directly or indirectly referenced by the test container 'g:\services\communityservice\communityservicetest\bin\release\communityservicetest.dll' was not found. Warning: Test Run deployment issue: The assembly or module 'IBM.Data.DB2' directly or indirectly referenced by the test container 'g:\services\communityservice\communityservicetest\bin\release\communityservicetest.dll' was not found. Warning: Test Run deployment issue: The assembly or module 'Oracle.DataAccess' directly or indirectly referenced by the test container 'g:\services\communityservice\communityservicetest\bin\release\communityservicetest.dll' was not found.

I have checked in the .csproj file. Those assemby references are not there