returns the error message . this is only non-null when #getstatus returns status #error_unknown concode_field_sep String mErrorMessage concode_elem_sep Result mResult concode_elem_sep Status mStatus concode_elem_sep Object mData concode_elem_sep Throwable mThrowable concode_field_sep Result getCopyWithData concode_elem_sep Throwable getException concode_elem_sep Result createResult concode_elem_sep Result createResult concode_elem_sep Result createResult concode_elem_sep Result createResult concode_elem_sep Status getStatus concode_elem_sep Object getData concode_elem_sep boolean isSuccess
String function ( ) { return mErrorMessage ; }