can't click "play"

[Aquinios]

Title:

can't click "play"​

Launcher Version:

1.4.7​

Modpack:

PathFinder​

Modpack Version:

1.0.3​

Log Link:

http://paste.feed-the-beast.com/view/9bb4d426​

Details of the issue:

easily i can't click the button "play" (the image is in italian because i'm italian)
"Gioca" means "play"

​

 

[mc.crab]

I think this is the problem:

FileOutputStream.open0:-2->Main.main:157: Could not create LogWriters.: java.io.FileNotFoundException: c:\ftb\FTBLauncherLog.txt (Impossibile trovare il percorso specificato)

Main.main:158: Check your FTB installation location's write access. Launch button is disabled until installation location is fixed.