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Try uninstalling it, restarting your iPhone, then reinstalling it.

There's also an iBooks configuration fix somewhere in Cydia but I believe it's for an actual error that pops up.
 
iBooks is made not to run on Jailbroken iOS devices.

No duh. That's why I'm asking how to fix it. There has to be some way around it.

As for the uninstalling, it is a bit messed up. There is no background to the icon (use glasklart, so that is unusual), and when I try to move icons around, there is no X to delete it.
 
try going on cydia and download the latest corona patch, restart the iphone and see if it works
 
Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

No need to be rude on Menge he's just informing. The latest version of redsnow has fixed this, just rerun the jailbreak (b5) or go into Cydia and install Corona.

I've installed Corona and it's been working ever since. Normally it force closes of says that it needs to be plugged into iTunes because of some corrupted configuration.
 
I was going to remove t manually tO delete it so I deleted the folder that sbsettIngs said it was in, and it fixed it somehow
 
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