ModuleNotFoundError: No module named 'tsim'

When I tried to run the tsim_examples in chisel, I ran ‘make run_chisel’ under the tsim_example directory, and in the end the error occurred as mentioned.

I tried to add the tsim path ‘$TVM_HOME/3rdparty/vta-hw/apps/tsim_example/python’ (which I thought might be) to PYTHONPATH and make again but nothing changed.

I can’t find similar problems in the community. Did I miss something?