EFile error code 184 means there are some errors in the tax return data, you need to fix it first and then efile again. There should be one or more error clue codes following code 184 as the EFILE result.
You need to look up the error clue code, (note, not code 184, but the error clue code) from Chapter 2 of CRA's EFILER manual.
You can find EFiler manual chapter 2 through this introductory link and please bookmark it or here is the direct link to the chapter 2:
Electronic Filers Manual for 2017 Income Tax and Benefit Returns: Chapter 2 Error MessagesTags: clue, efile, err184, error