However, I can offer some general troubleshooting steps and potential fixes that might help resolve or at least help you troubleshoot the issue:
If the file is corrupted at the structural level (XML data corruption), you need to strip the metadata. However, I can offer some general troubleshooting steps
If the error popped up but the project is still responsive, . Saving in a corrupted state may permanently damage the AEP file. However, I can offer some general troubleshooting steps