[Skimmer]

The problem was here.

pawn Код:

}
    else if(PlayerInfo[playerid][Level] >= 1)
{

With first bracket you're closing the callback and that means, the rest of the code is outside of script.

pawn Код:

// Begin of callback
public OnPlayerText(playerid, text[])
{
    new pTextd[241];
    format(pTextd, sizeof (pTextd), "[Member](%d) %s", playerid, text);
    SendPlayerMessageToAll(playerid, pTextd);
} // End of callback
// and the rest
    else if(PlayerInfo[playerid][Level] >= 1)
{
    format(pTextd, sizeof (pTextd), "[Admin](%d) %s", playerid, text);
    SendPlayerMessageToAll(playerid, pTextd);
    return 0;
}