Cause
The Main section in the beginning of Filesys.ini is missing or not correct.
Diagnosing the problem
Filesys.ini path is correct / reachable and the user have full control on the folder.
Resolving the problem
Modify the filesys.ini in order to have the [Main] section first, at least the 7 lines below and before any libraries references :
[Main]
Libs=C:Program Filescognosc8inLIBS.TAB
MaxUsers=5
Locks=C:Program Filescognosc8inLockslocks.log
Logins=C:Program Filescognosc8inLockslogins.log
UGR=C:Program Filescognosc8inUGR.TAB
Padlocks=C:Program Filescognosc8inPADLOCKS.TAB
You can also copy the file from another valid installation.