Error we_account (account system)

[EhsanReacher]

hi i use west rp gamemode type of the gamemode is social gaming i have a problem with we_accounts (account-system) when i connect to server it not show me the account system to create character and i got a error from consol
 

luccas_s.lua:284: attemp to concatenate global sserial {a nil value}

please help me