Atlaschat lua error

[EndMyLife]

In most servers,when I join,I see a "Something is creating script errors" notification at the top, I am unable to use mic communication or the chat,I am unable to see the HUD and,in some cases,I cannot even go back to the menu screen.
On various servers,I have found these 2 errors using the console.
1.[ERROR]
1. unknown - [C]:-1

Error in hook Think: addons/atlaschat/lua/atlaschat/cl_init.lua:997: attempt to call field 'GetValue' (a nil value)
stack traceback:
addons/atlaschat/lua/atlaschat/cl_init.lua:997: in function 'fn'
addons/ulx + ulib/lua/ulib/shared/hook.lua:109: in function <addons/ulx + ulib/lua/ulib/shared/hook.lua:92>
[C]: in function '

2.[ERROR] lua/atlaschat/cl_init.lua:987: attempt to call field 'GetValue' (a nil value)
1. fn - lua/atlaschat/cl_init.lua:987
2. unknown - addons/ulib/lua/ulib/shared/hook.lua:110

Can anybody please tell me what these two mean? And how do I resolve it?

[highlight](User was banned for this post ("Wrong Section. Go to the DEVELOPER DISCUSSION for help with LUA code" - Kiwi))[/highlight]

[c👌de_g🎷]

Make a ticket with the author.