Helix Whitelist system

I have a whitelist system for a helix but it's not working, can you help?

file link :https://s7.dosya.tc/server21/wzm677/wlsystem.rar.html

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there is such an error :::: [wlsystem] addons/wlsystem/lua/autorun/client/cl_whitelist.lua:46: Calling net.Start with unpooled message name! (Did you forget to call util.AddNetworkString serverside?)
1. Start - [C]:-1
2. DoClick - addons/wlsystem/lua/autorun/client/cl_whitelist.lua:46
3. OnMouseReleased - lua/vgui/dlabel.lua:237
4. unknown - lua/vgui/dmenuoption.lua:76 (x3)

I've been needing this for a while now, thank you so much! I will be using this for my friend's HL2RP server :D