error invalid data in index - incorrect header signature

hello, I want to ask why all my projects when the save error comes out invalid data in index - incorrect header signature. in all my projects. is there a solution? thanks

https://discourse.hkvstore.com/t/invalid-data-in-index-on-save/576/1

oke.
okay I’ve tried it but there are no changes there is still an error notification but the save still works

To ensure you did it correctly, you can delete the whole “Document\PHPMaker\Backup” folder and try again. Make sure that you have backup all your project files first.