[Ruben_Alonso]

Switch your register command to this one.

pawn Код:

CMD:register(playerid, params[])  
{ 
    new sStr[64]; 
    if(gPlayerLogged[playerid] == 1) 
        return SendClientMessage(playerid, COLOR_GREY, " You're already logged."); 

    format(sStr, 64, "Players/%s.ini", PlayerName(playerid)); 
    new File: hFile = fopen(sStr, io_read); 
    if(hFile) 
    { 
        SendClientMessage(playerid, COLOR_YELLOW, "This Nick already exists, use another."); 
        fclose(hFile); 
        ShowPlayerDialog(playerid, 2, DIALOG_STYLE_INPUT, "TEST", "TEST\n{5CACEE}Enter your Password to Register!", "Register", "Cancel"); 
        return 1; 
    } 
    new tmppass[64]; 
    if(sscanf(params, "s[64]", tmppass)) 
    { 
        OnPlayerRegister(playerid, tmppass); 
    } 
    else 
    { 
        SendClientMessage(playerid, COLOR_GRAD1, "/register [password]"); 
        ShowPlayerDialog(playerid, 2, DIALOG_STYLE_INPUT, "TEST", "TEST\n{5CACEE}Enter your Password to Register!", "Register", "Cancel"); 
    } 
    return 1; 
}

What's changed:

pawn Код:

if(sscanf(params, "d[64]", tmppass))

to

pawn Код:

if(sscanf(params, "s[64]", tmppass))