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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 is conflicting with the patched app. Uninstall the existing app before installing the patched app.
- ❗️ Error code `135` , `139` or `1` when patching the app
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Your device is not supported. Refer to 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 )
