There may be a spelling mistake with the project 'final name' or other declarations within the pom.xml. You could delete the project from the workspace then import it back. That should at least show some errors in console. You may get this error if you refractored your project name. Somehow, the refractor does not update the references.
Read full article from eclipse - An internal error occurred during: "Importing Maven projects". java.lang.NullPointerException - Stack Overflow
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