Anybody help me for this lua error

[gamemode_darkrp] addons/gamemode_darkrp/gamemodes/darkrp/gamemode/modules/base/cl_gamemode_functions.lua:29: attempt to call field 'toggleF4Menu' (a nil value)
1. Call - addons/gamemode_darkrp/gamemodes/darkrp/gamemode/modules/base/cl_gamemode_functions.lua:29
2. unknown - addons/gamemode_darkrp/gamemodes/darkrp/gamemode/modules/base/cl_gamemode_functions.lua:64

I get an error how can ı fix that