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This is a common problem but the solution is quite simple:
1) Right-click the game title on your Library screen
2) Select Properties on the menu that pops up
3) Select the Local Files tab on the next menu
4) Select "Verify Integrity of Local Files" on the final menu
That will take a few minutes but should fix the problem.
However this error also comes up (as it should) if the base game is not installed in the same location as Revision. As a mod it's required that you have the original game installed.