Error: -6144, -301 when opening a company file or restoring a backup

When opening a company file or restoring a backup, you get the following message:

Error -6144, -301

This may be caused by a damaged file. Follow the solutions below to resolve this error.

Solution 1: Fix company and network issues with QuickBooks File Doctor.

Solution 2: Restore a backup or a portable copy of your company file.

Note: Make sure to copy your backup or portable files locally before restoring your file.

Solution 3: Use Auto Data Recovery.