If you got this error with the June 16th patch, go to your AoC Root folder> RDB Folder and then delete the following file:RDBHashIndex.bin
You can also open your patcher.log file in your AoC Root folder> Scroll to the bottom and look a line or two up for what file got an error "wrong hash".
After you delete the problem file, just open up the patcher and go again.
