Saving Error - failed to insert entry: invalid object specified

It is a Git error. Your git repo for backup might be corrupted. You may try:

  1. Back up all your project in the backup folder (C:\Users\<user>\Documents\PHPMaker\Backup) first.
  2. Delete the git folder for backup (C:\Users\<user>\Documents\PHPMaker\Backup\.git). Note that this will delete all the backup history, so make sure you have done step 1.
  3. Re-open PHPMaker and try again.