I think you forgot those steps:
Step 2. Next, install iFunbox on your computer and then connect your iOS to your computer.
Step 3: Launch iFunbox. From the left column where your connected device is shown, click on Raw File System.
Step 4: Now on the right column where files and folders are shown, find and rename the file/.cydia_no_stash to /.cydia_no_stash-
Step 5: Once done, disconnect your device from computer and open Cydia, it should start preparing file system this time.
You can do the above with iFile too instead of iFunbox if you have iFile installed on the device.
Goodluck
Regards,
Ralph