keil5 project migration not possible.project is read-only.

As an AI language model, I do not have enough information to provide a specific solution to your problem. However, here are some general steps you can try:

1. Check if the project folder has write permissions. If not, change the permissions to allow write access.

2. Make sure that the project is not open in any other instance of Keil or any other application that may be accessing it.

3. Try copying the project to a different location and then try to migrate it.

4. Check if the project is a version-controlled project and if the project files are checked out by someone else.

5. If none of the above steps work, you may need to consult the Keil support team for further assistance.