Error importing package - how do I start again?

I'm using Trados Studio 2017. I got an error when trying to import a package. I deleted the files and tried to start again, but it didn't give me the option of where to save them, and just came up with an error saying the files at the location I saved them before couldn't be found. It's like it thinks the project is already there, but it isn't. I've deleted all the files, but I can't delete in Trados because it doesn't show in the project list. I've got Show all projects selected in all filter fields on the left-hand side, but it's not there. 

What can I do to start again and get this package open?

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