Every time a new untethered jailbreak solution is released, the Cydia servers are "flooded" by users eager to reinstall all the tweaks and applications that disappeared after a restore and after using the new jailbreak solution. As the untethered jailbreak solution for iOS 5.0.1 was released yesterday, the most important Cydia servers had very big problems in dealing with the traffic and you probably received errors when installing tweaks and applications. Everything depends on Cydia, everything will be solved in the following days when the traffic decreases and no, you have nothing to do.
