mod_abdu:
If he hasnt played sro in awhile then he may have to open silkroad normally so it can update.
There might be a file missing from his silkroad folder or from this clients folder, remember there are 3 files with this client.
If those aren't the cases i suggest a reinstall of silkroad, update it, and then put this client in.
Thats all I can think of as of right now, someone else will hopefully know more about this error because it definitely seems like an odd one.
csokisbugyi:
You need to open silkroad normally so it can update first. You do this by executing the silkroad.exe