Admin error


I keep getting this error when I try any admin commands please help
Connecting: Jack Ripper
Sending heartbeat to
Access denied for command add_principal.
Error running call reference function for resource essentialmode: citizen:/scripting/lua/scheduler.lua:351: server/main.lua:218: attempt to index a nil value (field ‘?’)
stack traceback:
server/main.lua:218: in upvalue ‘ref’
citizen:/scripting/lua/scheduler.lua:337: in function citizen:/scripting/lua/scheduler.lua:336
[C]: in function ‘xpcall’
citizen:/scripting/lua/scheduler.lua:336: in function citizen:/scripting/lua/scheduler.lua:335
stack traceback:
[C]: in function ‘error’
citizen:/scripting/lua/scheduler.lua:351: in function citizen:/scripting/lua/scheduler.lua:322


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