[JimmyCh]

The errors are coming because you have no "IsNumeric" stock in your script.
Add this anywhere in your script:

pawn Код:

IsNumeric(const string[])
{
    for (new i = 0, j = strlen(string); i < j; i++)
    {
        if (string[i] > '9' || string[i] < '0') return 0;
    }
    return 1;
}

Good luck!