clearml-server/apiserver/apierrors/apierror.py

class APIError(Exception):
    def __init__(self, msg, code=500, subcode=0, error_data=None, **_):
        super(APIError, self).__init__()
        self._msg = msg
        self._code = code
        self._subcode = subcode
        self._error_data = error_data or {}

    @property
    def msg(self):
        return self._msg

    @property
    def code(self):
        return self._code

    @property
    def subcode(self):
        return self._subcode

    @property
    def error_data(self):
        return self._error_data

    def __str__(self):
        return self.msg