当从现有源创建新项目时，Eclipse“无效项目描述”

I am trying to create a new project from existing source code. I keep getting the following error: "Invalid Project Description", project path "overlaps the location of another project" with the same name. The reason is that I created that project from the source code before, but then I deleted that project and deleted its whole directory, before adding the source code directory again. I tried everything like cleaning and restarting, but nothing worked. I looked in my workspace directory, but there are no traces for the old project. There are several questions around this problem such as this I am trying to create a new project from existi