Error occured validating manifest file
A manifest is a list of files present on your computer.
The manifest on the Steam servers contains the list of all the files which are supposed be there according to the most recent update.
Campus Data Managers can go into the Core Data Management site to the see the status of the Core Data s FTP files.
The status for these files will show as complete, incomplete, or failed.
Once your campus has created your files for import you can then send them to us using the s FTP option.
Disable all mods, restart Steam and check again if the error persists.
Another remedy is to open the game you are playing directly from its installation folder. All the games that you install are independent applications present with their executable present in the local files. If there is still an error, you can proceed with the other solutions listed below.
Campus Labs will set up a s FTP file directory for you.
Within that directory there will be a folder for each of the different files you will be sending.
We have listed down a number of steps and techniques to ensure that your problem goes away.