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What Causes Errors When Uploading an Avatar to VRChat?

In VRChat, avatars are uploaded using Unity and the VRChat SDK, but encountering errors during the process is not uncommon.

The causes of these errors are not singular; there are various issues such as different versions of Unity, bugs in the SDK, misconfiguration of the avatar, and problems with the Blueprint ID.

It is crucial to identify the causes one by one.

Initial Checklist to Confirm

• Check if the VRChat Creator Companion (VCC) is up to date
• Verify if you are using the recommended version of Unity for VRChat
• Look for any red errors displayed in the Unity Console
• Ensure there are no remaining Validation errors before Build & Publish
• Confirm that the Avatar Descriptor is correctly set
• Disable unnecessary avatars from the Hierarchy
• Detach the Blueprint ID and try re-uploading
• Test the same avatar in a new project

Red errors in the Unity Console are particularly important. Yellow warnings can sometimes be ignored, but red errors will usually prevent uploading.

The Version of Unity is Different

This is one of the most common causes.

VRChat has specific Unity versions that it supports. Updating to the latest version from Unity Hub may seem good at first glance, but it can actually prevent uploads.

Always use the recommended Unity version provided by VRChat.

Update VRChat SDK and Creator Companion

Using an older SDK can lead to various errors during upload.

Updating the SDK and packages to the latest version from Creator Companion can often resolve issues.

Conversely, some SDK versions may display a successful upload status, but the changes might not actually reflect.

Check for Errors in the Unity Console

If you encounter Build Failed, start by opening the Unity Console.

If there are Missing Script or Shader errors, or compilation errors, the upload will not succeed until they are resolved.

This is especially true if multiple tools or gimmicks have been added to a purchased avatar, which can lead to conflicts.

Reset the Blueprint ID

If the Blueprint ID is corrupted, executing Detach Blueprint and uploading it as a new Blueprint may resolve the issue.

This is also effective if there are lingering or duplicated Blueprint IDs from others.

Check the Avatar Descriptor

If the Avatar Descriptor is not set, the Build & Publish process cannot be initiated.

Select the target object in the Hierarchy and check if the Avatar Descriptor component exists.

Resolve Validation Errors

The VRChat SDK has a Validation feature.

Issues such as polygon count, memory usage, and configuration errors will be displayed, so correct the items that are causing errors.

Recently, server-side Security Checks have also been introduced, meaning that avatars with issues may be unable to be used even if uploaded successfully.

If "Security Checks Failed" Appears

If you see "Security Checks Failed" after upload, you are hitting the server-side safety checks.

• Update the SDK to the latest version
• Try removing any special tools or modified scripts
• Check memory usage and optimization

Re-uploading with the latest SDK may resolve the issue.

Thumbnail-Related Errors

There have been recent reports of failed thumbnail image generation preventing uploads.

Re-capturing from the scene or resetting the image may improve the situation.

Test with a New Project

If you cannot identify the cause, create a new avatar project and try uploading just the avatar.

If this succeeds, it may indicate that assets or tools in the existing project are conflicting.

Sharing Error Details Can Speed Up Resolution

Sharing the content of the Unity Console and screenshots can help pinpoint the issue more easily.

Images, as well as Console logs and Editor.log, can expedite the resolution process.

In such cases, UploadF is recommended.

It can be used for free from both PC and smartphone, allowing for easy drag-and-drop uploads. You can share not only screenshots but also log files, and it offers password protection and deletion features, making it convenient for safely sharing information with the VRChat community or support.

If you want to blur images before sharing, you can also use the online image editing feature.

Conclusion

Errors when uploading avatars to VRChat can arise from various factors, including Unity, SDK, and avatar settings.

First, check the Unity version and SDK, and resolve any red errors in the Unity Console.

If issues persist, consider testing in a new project or recreating the Blueprint.

When sharing error details, sharing screenshots and log files via UploadF will make it easier to seek advice from others.

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