The release of the Corona untethered jailbreak for iOS 5.0.1 hasn’t comewith its fair share of problems, which led the Chronic Dev Team to update the tool a couple weeks ago to fix the Launchctl error.
Unfortunately, this update was not enough to fix all the problems inherent to Corona. The main issue that users have been experiencing is with the iBooks app, which would just display an error message at launch. We shared a few workarounds with you to fix this problem, but we knew an official fix was on the way…
According to Saurik, Corona has been updated to version 1.0-5, and fixes the iBooks problems as well as the launchctl error mentioned above.
Now you have two options. If you installed Corona from Cydia, just launch Cydia and install the update when prompted. If you jailbroke using RedSn0w, simply go to Cydia and install Corona from there. This will supposedly take care of all your problems.
If you had previously installed iBookFix, I’m not 100% sure, but I assume it’d be wise to first uninstall it, then install/update Corona.