Open 1.4.1: Infinity don't open 1.5.1

[Sjaak]

Version:
1.4.1

What is the bug:
I can't get to work, when i open it says this in the console

Error while gathering assets: java.lang.NumberFormatException: For input string: "1395-1710ls"

Mod & Version:


Paste.feed-the-beast.com log:
http://paste.feed-the-beast.com/view/bffb12c0

Can it be repeated:


Known Fix:

 

[jikuja]

Update your launcher. If you are still using 1.4.3 update must be manually.