[Hugh G. Reckshun]

Yea. If it's volt host, your probz hosting in france.

This happened to me.
You need to use an FTP client to put your gamemode into the file manager.

Reinstall your server,
Keep all the start files.
Open the FTP client
Make an FTP account [above file manager]
The host is columba.volt-host.com and the port is 21
Enter your ftp account password
Usernam
and click connect,

Then transfer the gamemode into the gamemodes folder
and all the other stuff, but dont delete anything that was already there.
Then, open your server.cfg
edit the gamemode to : gamemode0 [the name of your gamemode]1

Then restart your server. Thats how i did it.