snd_music_mainmenu = sound_add('data\sounds\snd_music_mainmenu.mp3',0,1);
snd_music_flows = sound_add('data\sounds\snd_music_flows.mp3',0,1);

global.musicM = 1

if global.musicM <0
{
sprite_index = s_music_no
}
if global.musicM = 0
{
sprite_index = s_music_no
}
if global.musicM = 1
{
sprite_index = s_music_menu
sound_play(o_load_music_menu.snd_music_mainmenu)
}
if global.musicM = 2
{
sprite_index = s_music_flows
sound_play(o_load_music_menu.snd_music_flows)
}
if global.musicM >2
{
sprite_index = s_music_no
}

___________________________________________  
ERROR in  
action number 1  
of  Step Event  
for object objPlayer:  

Error in code at line 37:  
       if((x!=xpr||y!=ypr)&&step>=global.step_n){//Если мы сменились координаты и     
                    ^  
at position 36: Unknown variable step_n  

raz_sek=min(room_speed,15);  
global.step_n=(room_speed/raz_sek)-1;  

  global.clienttcpsocket = tcpaccept(global.listeningsocket,true) //If someone tries to connect accept him
         if global.clienttcpsocket //If someone connected
{
   playerid = newplayerid(); //generate player id
   if(playerid < 0)exit;     //if too many players
   i = instance_create(0, 0, objPlayer);  //create object for player
   i.socketid = player;      //Set socket id for player to the socket that was just accepted
   i.playerid = playerid;
   players[playerid] = i;
   setnagle(player, false);  //turn off nagle algorithm for socket
    
   //Tell all players that i joined
   clearbuffer();
   writebyte(newplayer); //Write message id
   writebyte(playerid);  //Write the new players PlayerId
   writeshort(0);
   writeshort(0);
   writestring("", true);
   //Send to all other players
   with(objPlayer)
   {
     if(id != other.i)
     {
       sendmessage(socketid);
     }
   }
   //Tell me all the players that have already joined
   with(objPlayer)
   {
     if(id != other.i)
     {
       clearbuffer();
       writebyte(playerid);
       writebyte(newplayer);
       writeshort(x);
       writeshort(y);
       writestring(nick, true);
       sendmessage(other.player);    //send to me
     }
   }
}

while(1)                           //Start infinite loop  
{  
{  
instance_destroy();  
break;  
}  
mid = readbyte();     //read message id  

switch(mid)  
{  
case newplayer:  
pid = readbyte();       //read playerid  
player = instance_create(0, 0, objRemote); //create instance of objRemote (remote player)  
player.x = readshort();  
player.y = readshort();  
player.nick = readstring();  
players[pid] = player;  //Add instance to playerlist  
break;  

case playerlocation:  
player = players[readbyte()];   //get id of player from playerlist  
player.x = readshort();         //set x  
player.y = readshort();         //set y  
break;  

case exitgame:  
player = players[readbyte()];   //get id of player from playerlist  
with(player)instance_destroy(); //destroy  
break;  

case playernick:  
player = players[readbyte()];   //get id of player from playerlist  
player.nick = readstring();     //set nickname  
break;  
}  
}