My second game cant publish, and i dont know why.

Did you start afresh with the second game or did you simply edit an existing one? If you edited an existing one you'll need to generate a new 'Game ID' otherwise it will just over-right the first published game.

Go to 'game' at top of left pane, then click the 'Generate' button at the end of the long code.

If you're offline, go to Tools > Publish.