"Files are not signed by a key accepted by this server"-Issue

["Files are not signed by a key accepted by this server"-Issue]

i tried from steam and from programs... still not working , and at the main menu i have the right version and mod - overwatch , still missing files

any help ?

 

This is my Arma 2 folder ,

 

["Files are not signed by a key accepted by this server"-Issue]

its not specific files , and i have all the available mods , and versions , still got missing files. 

["Files are not signed by a key accepted by this server"-Issue]

you answer me or to this guy ? because its my post...

and if this link for me i already tried that

["Files are not signed by a key accepted by this server"-Issue]

Hey , 

When im trying to join server from any program or the game , i got massage about deleted files , 

the massage is:

"you cannot play/edit this mission; it is dependent on downloadable content that has been deleted."

this is the massage and after this all the "deleted" files.

( every server - other deleted files ) i don't know what to do and i need help.

pls help me :(