Import Dataset gives "Name is not available" error

When I import a .dxf under the Mapping menu item in Professional, the import fails with the message "Name is not available".  I am doing this work at the Project level, not at the System level. I do have an imported dataset with the same name I am using here in another project, but because it is also at the Project level, it seems there should be no conflict.

Why is this failing to import?

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