dbForge doesn't recognize null. It has to be "null"

dbForge doesn't recognize null. It has to be "null"

I am having several issues when importing from a json file when using dbForge version 6.4.7
- I have the setting to ignore errors yet dbForge imported nothing. 
- I attached the log file. The file mentions Row: 201. If it read 200 rows successfully, why didn't these rows get imported?  The ignore errors setting then is pretty useless. Same thing for prompt user setting. It doesn't prompt the user. In both cases, it just cancels and nothing is imported.
The log needs to show which line number in the input file caused the error so I can quickly know where the issue is. Row number is not very useful, especially if each row spans several lines.
- When there are errors, the back button is disabled. Why can't I go back and try again? I have to start all over again.
- The first time I got errors, it's because of comments in the file.  dbForge should skip comments. Also after I removed them, the import dialog didn't recognize the changes I made and still gave errors. It seems it's using a cached version. It needs to read the physical file every time. The file could have been edited.
- After several tries, I found out that null as a value is not accepted. It has to be 
null".