The "unity missing project id" error is usually caused by one of two issues:
Missing or Incorrect Project Settings: The Unity editor relies on certain project settings to correctly identify your Unity project. If the Project ID is not correctly set in your project settings, this can cause the "missing project ID" error.
Cloud Service Connection Issues: Unity Services (like Unity Ads or Unity Cloud Build) require a valid project ID to connect your project with the service. If you haven't properly connected your Unity project with these services, or if there's an issue with the connection, you may encounter the "missing project ID" error.
To fix the "unity missing project id" error, follow these steps:
Check Project Settings: Open your Unity project and navigate to
Edit > Project Settings > Services. Make sure that a correct Project ID is entered here. If you're unsure what your Project ID is, you can find it on your Unity Dashboard.
Ensure Proper Cloud Service Connection: If you're using Unity cloud services, ensure that you have properly connected your project to these services. In your Unity dashboard, navigate to the specific service you're using (like Unity Ads or Unity Cloud Build), and follow the instructions to link your project. Make sure to enter your Project ID correctly when prompted.
Reimport Project: If the above solutions don't work, there might be a corruption issue within your project files. Try creating a new project, then import the assets from the old project into the new project one by one. Be sure to check if the error persists after each import to identify if a specific asset or setting is causing the problem.
By following these steps, you should be able to resolve the "unity missing project id" error.