For those of you that recently jaibroke and found some errors regarding cydia dependencies such as substrate v0.9551, your issue is caused by bad timestamps on the evasi0n repository payloads. The solution is to clean it out with icleaner:

Use iCleaner to clear out your repo data, and then everything will reload properly. Here’s what you do:
1. install iCleaner (free)
2. Turn off everything in iCleaner
3. Turn on the “Cydia Sources” switch
4. Hit “Clean” on the top right
5. Go back into cydia, tap the changes tab, tap ‘refresh’ at top left, and wait for data to download and reloading data to finish
6. Uninstall iCleaner (optional)