Hi,
usually this problem can be fixed by remove .metadata folder in the workspace, or create a new folder as a workspace to load your project.
but please note, .metadata folder stores the workspace settings or preferences. if you have customized workspace setting and you don't want to lose it, refer Erich's article to export it first.
Copy my workspace settings | MCU on Eclipse
Have a great day,
Jennie Zhang
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------