[Konstantinos]

From what I see, your password should be a string and not a number.

Switch to:

pawn Код:

forward OnPlayerLogin(playerid, password[]);
public OnPlayerLogin(playerid, password[])

pawn Код:

new tmppass[64];
// assign the password
OnPlayerLogin(playerid,tmppass);// It won't give arror anymore, since you parse a string in it.

pawn Код:

public OnPlayerLogin(playerid, password[])
{
    new string2[256], keystring[256];
    format(string2, sizeof(string2), "%s.ini", PlayerName(playerid));
    keystring = dini_Get(string2, "Key");
    if(strcmp(keystring, password, true) == 0) // I assume that's the password check string1 is equal to string2
    {

pawn Код:

new tmp[64];
strmid(tmp, inputtext, 0, strlen(inputtext), 255);
OnPlayerLogin(playerid,tmp);// Insert a string will prevent the error