Hello 7777777
this a file corruption problem probably due to a bad memory Dimms. Anyway the more easy attempt to recover your timeline and your repositories is to create a new project and import the timelines files from corrupted project to the new one. Alternatively you can open the project folder and rename the project names in order to load a backup copy. If the folder of your project is named YOURPROJECT, you will find a file YOURPROJECT.TWPJ and if backups exist too you will find YOURPROJECT.BK1 and YOURPROJECT.BK2. Renaming .TWPJ to TWPO and .BK1 or .BK2 to .TWPJ you should recover your project without losses.
Best Regards
Roberto Castellano