plugins/tcs-plugins/cli.lua:15: attempt to index field 'ui' (a nil value)
stack traceback:
plugins/tcs-plugins/cli.lua:15: in function '?'
vo/vo_cmds.lua:12: in function 'func'
vo/vo_event.lua:63: in function <vo/vo_event.lua:61>
[C]: in function 'xpcall'
vo/vo_event.lua:87: in function '_do_event'
vo/vo_event.lua:107: in function <vo/vo_event.lua:103>
[C]: in function 'gkinterfaceGKProcessCommand'
vo/vo.lua:1133: in function 'GKProcessCommand'
vo/if_chatlog.lua:95: in function <vo/if_chatlog.lua:55>
(tail call): ?
(tail call): ?

What were you doing when it happened? There are two issues I'm aware of with TCS.

I was trying to load the tcs gui with the /tcs command

I'm not sure about that one.
What OS are you on?
Did you modify any files?

On linux. i have not modified anything.