[Codeah]

Line 623, the error says it all. OnPlayerCommandText is supposed to return a value.

Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(!strcmp(cmdtext, "/vehicle", true))
    {
        //Your stuff
        return 1;
        // Returning 1 informs the server that the command has been processed.
        // OnPlayerCommandText won't be called in other scripts.
    }
    return 0; //<!--- This is what you are missing.
    // Returning 0 informs the server that the command hasn't been processed by this script.
    // OnPlayerCommandText will be called in other scripts until one returns 1.
    // If no scripts return 1, the 'SERVER: Unknown Command' message will be shown to the player.
}

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Line 637:
GameTextForPlayer has more arguments than just two.

Код:

GameTextForPlayer(playerid, "Text", 5000, 2);