c_helper.py:125: in _t
    stdout, stderr, returncode = self._run_exec(args=args, input_=input_, timeout=timeout)
c_helper.py:85: in _run_exec
    return _exec([os.path.join(".", self.executable_name)] + (args or []), **kwargs)
c_helper.py:471: in _exec
    stdout, stderr = proc.communicate(timeout=timeout, input=input_)
/local/packages/python-3.10/lib/python3.10/subprocess.py:1152: in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
/local/packages/python-3.10/lib/python3.10/subprocess.py:2041: in _communicate
    stdout = self._translate_newlines(stdout,
/local/packages/python-3.10/lib/python3.10/subprocess.py:1029: in _translate_newlines
    data = data.decode(encoding, errors)
E   UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfd in position 4: invalid start byte

WHAT IS THIS ERROR?