Solution 1: Restore a backup of company file
The user will be able to fix QuickBooks Error -6150, -1006 by restoring the backup of company file.
The point to be noted here is that after the user converts a company file to a later version of QB, he/she cannot open it in a previous version. In case the user wants to use the previous QB version, then in that case he/she needs to restore a backup file created using that version.
Regards,
Jimmy