Windows .exe java.lang.NoClassDefFoundError: org/apache/commons/io/Charsets

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Operating System, bit type:
Java version/update, bit type:
Launcher version:
Completed the troubleshooting guide (y/n):
Console log, pastebin.com link:
Description of the problem:

Use the format.


Many of us reply to threads based on the number of replies to that thread. By just posting various forms of "why no help yet" you've put yourself farther on the list of threads we'll click on.

We look for older threads (as in not posted today, and not on page 1) and threads with a reply count of 0, so we can most accurately find the people who have gotten no attention, and have been waiting the longest.
 
Operating System, bit type:
Java version/update, bit type:
Launcher version:
Completed the troubleshooting guide (y/n):
Console log, pastebin.com link:
Description of the problem:


Use the format.


Many of us reply to threads based on the number of replies to that thread. By just posting various forms of "why no help yet" you've put yourself farther on the list of threads we'll click on.

We look for older threads (as in not posted today, and not on page 1) and threads with a reply count of 0, so we can most accurately find the people who have gotten no attention, and have been waiting the longest.

Operating System, bit type: win 7
Java version/update, bit type: 7.45 both 32 and 64 bit
Launcher version: latest
Completed the troubleshooting guide (y/n): y
Console log, pastebin.com link: http://pastebin.com/DJzCW8W7
Description of the problem: the log shows everything, the game won´t launch because of some apache classes missing. only appears with the newer modpacks
 
I don´t have access to it, might take some time. But the exception should cover any needed information also if it doesn´t fit the mask.
 
Find the folder called 'Libraries' and delete it, it should be in the same folder as the ftb-launcher.exe file. This will redownload the libraries and should fix the error.