Modpack download problem

[xXFtbManXx]

Hello!

I'm xXFtbManXx and I'm wanted to play FTB minecraft. I have premium minecraft acc and I log in to my minecraft FTB launcher with my premium name and password. Then I press 'Launch'. Then launcher download modpack and run minecraft 1.6.4 and console. Console download all mods in modpack and close minecraft 1.6.4 and console. But why then closed? This is my problem! Please answer.

Have a nice day!

 

[UniZero]

If you crashed then we need a log. If the console closes then go to the options and place a check in "reopen launcher after exiting minecraft" this will cause the launcher to reopen. Now go to the console and click "paste my log to pastebin" button and link the log here.

 

[xXFtbManXx]

I don't have crashed acc, I have premium for 19,95€. What you mean with word 'log'? Do you mean sign in? Sorry I don't know what mean log, because I'm slovenian. I'll try it with pastebin.com and I'll tell what will happen.