[ASK] Forza Horizon 2

why when i want to mod forza horizon 2 I always failed ? I keep trying but the result was the same.
it says :

"An error has occured while writing back to the loaded package !
If you see a developer, the following message will help him, resolve the issue:

The process cannot access the file ‘F:\Content\E00008B55204E57B\4D530AA4\00000001\ForzaProfile’ because it is being used by another process."

anyone can solve this ?

Sorry, Noob here:p

same happened to me it came up with an error message but the money was still what I modded it to