Unity Package Manager Errors

How to fix it

Try these in order — the most common fix is first.

1. 1. Check the network

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   1. Disable VPN or proxy and allow Unity through the firewall
   2. Retry from Window > Package Manager and click Refresh
   Did this fix it? Yes No

2. 2. Clear the package cache

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   1. Close Unity
   2. Delete the Library/PackageCache folder in the project
   3. Reopen to force re-download
   Did this fix it? Yes No

3. 3. Repair manifest.json

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   1. Open Packages/manifest.json
   2. Remove the line for the failing package
   3. Check version numbers and scoped registries
   4. Save and reopen the project
   Did this fix it? Yes No

4. 4. Install Git for Git packages

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   1. Install Git and make sure it is on your PATH
   2. Restart Unity Hub and the Editor
   Did this fix it? Yes No

Symptoms

Package Manager shows 'Error adding package', 'An error occurred while resolving packages', 'Cannot perform upm operation', or stays empty.

Why it happens

• Firewall, proxy, or VPN blocking the Unity package registry
• Broken or conflicting entries in Packages/manifest.json
• Git not installed for Git URL packages
• Corrupted package cache
• Package version incompatible with the Editor version

This guide also covers

• unity package manager error
• unity an error occurred while resolving packages
• unity package manager empty
• unity cannot connect to registry

Other Unity errors

• Unity Hub Not Opening
• Unity License Activation Failed
• Unity Editor Crashing
• Unity Build Failed
• Unity Android Gradle Build Failed
• Unity Slow Compile and Domain Reload
• Why Is Unity Editor So Slow
• Unity Pink Materials After Changing Render Pipeline