Alert! Package folder already used in project

Hello, I created a project with existing sources. I removed after that
project. And now I am trying to create a new project with the same sources
used by the first, but this message appears:
'Package folder already used in project....' (with the name of the first
project).

I looked at my computer and there is no trace of the old project. Does
anyone know how I can resolve this? I have tried everything and nothing
works.

Thanks in advance. Raquel 
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