Warewolf test framework is throwing error for few tools

I am not able to write test cases for a few workflows because Warewolf test framework is crashing. After a detailed investigation, we found that if we used any tools from the list below in the workflow, the Warewolf test framework would not respond.

• Sequence
• For each
• Select & Apply

We faced similar problems in different warewolf version. We tested in latest 2.8.7.1 version as well in previous 2.8.2.9 version.

Test framework error :