If the above steps do not work, the error message is accurate, and you must reinstall.
Sometimes the game tries to read resource files from a protected Windows folder (like ProgramData or AppData) but lacks permission.
Steps:
If that works, make it permanent:
For Steam users, the "Verify integrity of game files" tool is the direct counter to this error. It scans every resource file and redownloads only the broken ones.
Steps:
This error indicates corrupted or missing game resource files. The goal: restore integrity with minimum reinstall time. Steps progress from least to most disruptive; try them in order.