Data error (cyclic redundancy check).

Its a bit unusual, but this error says there is a problem with your HDD/SSD.
(i see this error the first time in SupCom)

Cyclic Redundancy Check (CRC) is basically a data verification method that computer uses to check the accuracy of data on the disks (hard disk drive, optical disks such as CD, DVD etc.) CRC detects accidental changes to raw data residing in the storage media.

I would suggest to check your drives:
Are all cables plugged in correctly ?
chkdsk C: /f (error scan for disc files)
sfc /scannow (validate system files)

In case there are too many errors with chkdsk or sfc then reinstall windows.
hopefully you don't need a new HDD/SSD here

After this make a filecheck from the game via steam;
Then delete everything inside C:\ProgramData\FAForever\gamedata (remove the FAF game data)
Deinstall the FAF client and make a fresh new install.

Now try again;
Host a game with the FAF client to redownload the deleted files from FAF-gamdata.

Note:
Please have in mind the error text was printed from the game,
so its possible that this error is a false interpretation of the real error cause.