SerializableException: The server did not provide a meaningful reply

[ZavalichiR]

VisualStudio Professional 2019
.Net Framework 4.8

Error after CoverTestCommand

Hello!
In Tests tab I have this structure:

ProjectName
--Solution1TestsName
----- Solution1Tests
---- module1
---- module2
--Solution2TestsName
----- Solution2Tests
---- module1
---- module2

If I press RightClick on module or Solution1TestsName or Solution1Tests and CoverTests -> all works fine
If I press RightClick on ProjectName and CoverTests -> I get this warning after all tests are executed: SerializableException: The server did not provide a meaningful reply