Lockscreen theme won't change

ohhitsanna

So I recently jailbroken my iPhone 4S and tried to put a lockscreen theme on it, when I did the only thing that would happen is the 'slide to unlock' text would be gone, but I wouldn't have the theme. I've tried all sorts of themes that are compatible with the ios7 jailbreak and even ones that weren't (just to see if it would work) but none did.

If anyone knows how to solve this problem could you please let me know, thank you in advance.