When I click Play Launcher restarts

[Awesomebynature]

I just installed Attack of the B-team mod pack, the launcher installed everything but when I click play the launcher disappears and comes back after a second but nothing changes so it basically resets every time I click play. Is someone else having this issue or can anyone help me? please D;

[Kalbintion]

please post issues on the tracker. The tracker (and tracker guidelines) link is available in my signature below.