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Make sure that you have the latest version of Cydia (version 1.1.1) installed on your jailbroken iPhone.
If you have the old version, then I would recommend you to update your Cydia by using the steps below:
Step 1: Launch Cydia and go to Changes. Then under Changes tab, tap the Refresh button in the top left corner to start downloading Cydia 1.1.1.
Step 2: After Cydia download is complete and all packages have been updated, the app will prompt you with the option to complete the Upgrade in order to install the new Cydia. This process will take few minutes as it also updates other repos, apps, and tweaks that you installed on your device.
Step 3: The app will prompt you to confirm the update. Just simply confirm it and wait for Cydia to complete all the necessary changes. Once done, just simply close Cydia app.
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