csgo@srv48010:~$ ./csgoserver st
[ .... ] Starting csgo-server: tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
tmux: invalid LC_ALL, LC_CTYPE or LANG
[ FAIL ] Starting csgo-server: Unable to start LinuxGSM
[ FAIL ] Starting csgo-server: Unable to start LinuxGSM: Tmux error:

Command
=================================
tmux new-session -d -s "csgo-server" "./srcds_run -game csgo -usercon -strictportbind -ip 84.200.113.140 -port 27015 +clientport 27005 +tv_port 27020 +sv_setsteamaccount  -tickrate 124 +map de_dust2 +servercfgfile csgo-server.cfg -maxplayers_override 11 +mapgroup mg_active +game_mode 0 +game_type 0 +host_workshop_collection  +workshop_start_map  -authkey "

Error
=================================
tmux: invalid LC_ALL, LC_CTYPE or LANG

Fix
=================================
No known fix currently. Please log an issue.
https://gameservermanagers.com/support