Please help! \ Mounted paks num(51) not equal to expected paks num(50). Please verify your installation !0x0000000000000000

When I try to start a game, I get an error
Fatal error: [File:C:\B\branch_ConanSandbox_live\code\UE4\Source\ConanSandbox\ConanSandbox.cpp] [Line: 332] Mounted paks num(51) not equal to expected paks num(50). Please verify your installation !0x0000000000000000
reinstalled the game and deleted the mods did not help

Hey @Boroda

Welcome to our community.
Have you checked the integrity of the game files?
Also, do you have any antivirus program that could be interfering with any of the files?

Yes, I checked all the files were successful, the antivirus specifically turned off

Hey @Boroda

Could you right click on the game in your Steam library, go to properties, then Betas tab, and make sure your option says “NONE - Opt out of all beta programs”?