Getting Error : Symbol extraction process failed in Organizer

I am getting following error while I am connecting my iPhone to organizer.

I perform following steps to avoid collecting data every time I connect my device to Mac.

To do this, simply go to the /Developer/Platforms/iPhoneOS.platform/DeviceSupport folder and manually copy the Symbols subfolder and/or the DeveloperDiskImage.* files from 4.2 (8C134) to 4.2.1 (8C148) (or whatever release folder Organizer creates for your device).

Wh开发者_StackOverflow社区at can be done?

I had the same problem, but what worked for me, was to go to /Developer/Platforms/iPhoneOS.platform/DeviceSupport and just delete the 4.2.1 (8C148) files, by typing

sudo rm -fr "4.2.1 (8C148)". 

After that I plugged in my iPhone again, and it fetched the debug symbols just fine.