The file can be opened normally, then after clicking into a segment, the error message "Object reference not set to an instance of an object" is thrown, which does not seem to impact any functionality. Segments can be edited, but after confirming them, Trados Studio closes and shows the error message "Cannot access a disposed object. Object name: Infragistics.Win.UltraWinStatusBar.UltraStatus". Changed segments are written into the Translation Memory, but they are not saved in the Editor.

Remove all Translation Memories and Termbases from your Project Settings. No more error messages occur after adding the Translation Memories and Termbases again.

Trados Studio cannot access a Translation Memory of Termbase due to corrupt Translation Memories and Termbases information.