For those who are still trying to find the answer to this question, the following procedure worked for me:
Make sure the Project Explorer tab is visible. If not, select Window โ Show View โ Other ..., and then expand the General group and click Project Explorer. Click OK.
On the Project Explorer tab, expand the Local File System group and right-click any empty area with this window and select Refresh.
When prompted to delete the orphaned project, select OK.
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