What does this mean:
although everything works fine, but after executing main () the error message: "Crash in start client" is shown
You execute main manualy later, or you mean the app is starting correctly, but after Init screen "start client" function called in main() gives error ?
Post your "start client" script and the lines in main() around the call to "start client".
This usualy happens to me because of accidentaly using a pointer instead of the value... I mean , for example "player_pos" instead of "player_pos[0]".
