how to setup custom exception handler?

[qxrftz]

Here is my code, but it doesn't work.

settings.py:
RQ_EXCEPTION_HANDLERS=['path.to.handler']


def handler(job, exc_type, exc_value, traceback):
    callback = job.kwargs['callback']
    callback(exc_type, exc_value, traceback)

[dapicester]

I also have a similar setup and my error handler is not called. I also wrote a unit test and indeed the error handler is not called. Any help?