You have a choice... go back to stock, or don't use RedBox app.
This is only going to get worse... more and more developers are building in checks for jailbroken devices, and writing their apps to not function on jailbroken devices.
Op try the xcon app.
Or try renaming cydia.app when you want to use redbox app? if you go the name change route make sure you remember to change the name back to proper when you want to tweak