Permission denied when trying to run public tests

Hey,

I am working on the first task. Now I want to test my code by running the public test for the first assignment:

./run_tests.py -t test_check_win_1

However, I received an error, saying:

zsh: permission denied: ./run_tests.py

And the same problem has occured when I tried to build a testbox.
What could be the problem?

Btw, the code itself assembles without any errors in MIPS.

Yes, I am in the VM.
This helped a lot, the second command is working for me. Thank you.