**edited version - problem solved**
update: Ok guys I solved the problem: I moved the .wrp file from he source folder to the main folder, updated the config directory and it now works.
I have recently started modelling my own terrain; so far I'm testing on a small chunk of512x512 grid, 5 m cell.
I exported the WRP (1.13 Mb) and packed everythink with pbo project (no errors, pbo size: 88.5 Mb).
If I go in game I can select/activate the MOD but when I launch it I get this error message:
cannot load world \...\...\source\gbco_brussa2.wrp
Any ideas what could be the cause?
btw the files I am using are:
Thank you very much anyone for any help.