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# ❔ Troubleshooting
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In case you encounter any issues while using ReVanced Manager, please refer to this page for possible solutions.
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- 💉 Patching fails with an error
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Make sure ReVanced Manager is up to date by following [🔄 Updating ReVanced Manager ](2_3_updating.md ) and select the **Default** button when choosing patches.
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- 🚫 App not installed as package conflicts with an existing package
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An existing installation of the app you're trying to patch conflicts with the patched app (i.e., signature mismatch or downgrade). Uninstall the existing app before installing the patched app.
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- ❗️ Error code `135` , `139` or `1` when patching the app
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You may be trying to patch a split APK[^1]. This may not work under certain circumstances. In such a case, patch a full APK.
Your device may otherwise be unsupported. Please look at the [Prerequisites ](0_prerequisites.md ) page for supported devices.
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Alternatively, you can use [ReVanced CLI ](https://github.com/revanced/revanced-cli ) to patch the app.
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- 🚨 Patched app crashes on launch
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Select the **Default** button when choosing patches.
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## ⏭️ What's next
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The next page will teach you how to build ReVanced Manager from source.
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Continue: [🔨 Building from source ](4_building.md )
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[^1]: https://developer.android.com/guide/app-bundle/app-bundle-format
