animation doesn't contain the root track. Import failed.

As an AI language model, I don't have enough context to provide a specific solution to your problem, but in general, this error message usually indicates that there is a problem with the animation file you are trying to import. It could be that the file is corrupted or incomplete, or it may be a compatibility issue with the program you are using to import it.

To troubleshoot this issue, you can try the following steps:

1. Check the file format of the animation file and ensure that it is supported by the program you are using.
2. Verify that the file is not corrupted by trying to open it in a different program or by re-downloading it from the source.
3. If you are importing the animation into a larger project, check that all the necessary files and dependencies are present and correctly linked.
4. Try importing the animation into a new project to see if the issue persists.
5. If none of these steps work, try contacting the support team for the program you are using for further assistance.