So I installed ROM Manager and installed CWM Recovery. Created a backup and it worked fine. I then wanted to try out Nova Launcher and successfully installed it by rebooting into CWM Recovery and installing from zip file. However, when I went to uninstall Nova Launcher using the same method I ran into a problem. Through ROM Manager I hit Reboot into Recovery, then before the Nexus reboots to recovery, a message pops up for a split second and all I could read was something along the lines of 'Unfortunately system has stopped." before the phone reboots. Then once the phone reboots an image of a red triangle with an exclamation point inside on top of an android on its back. I then have to remove the battery to reboot the phone. Has anyone run into this problem? Thoughts?