Solved Hook

Im bypaas anticheat toolkit. Encryption Obscured, i know if make generate key then value nor changed. value ^ 0 = value. Im make cod:
unsigned char old_genkey(void *instance);
unsigned char genkey(void *instance) {
return 0;
}

HOOK_LIB("libil2cpp.so", "0x77C0E4", genkey, old_genkey);

But this cod don't work, ida find error. How to fix error?(I'm need load il2cpp>>this hook(changed generate key > 0 >>hook_lib and etc..

(Im use lgl mod menu 3.2)