Cydia can only handle up to around 65k packages. If all your sources combined cumulatively exceeds that amount, you get that errorOn my iphone 5 7.0.6 jailbroken I had about 15 sources.
On my brand new 5S 7.0.6 I can't add more then 7 of those 15 packages I had installed without it saying the packages are exceeded then cydia turns blank.
Anyone know why??