crashes

[mangoman300]

so ive downloaded several packs and a lot of them wont open its not because of my pc but ill hit play the screen will pop up and then will just close its self no log or nothing even some small modpacks are crashing even though I can run huge ones like the 1.7.10 pack witch ive even added more modifications too!

[JaariAtmc]

Please include your launcher log -> upload it to paste.ubuntu.com or www.pastebin.com and give us the link. Now you are thinking "I have no log" but this log is whatever is seen in your launcher console. You can access these by pressing Launcher Options -> Open Logs -> techniclauncher_2016-02-## (aka your most recent log of you trying to load it).