When another project is translated by opening WorldServer project, should another folder be createad?, Then, how?

In opening WorldServer package, at the fourth step of "Confirmation of the contents of the package", the process stops, and the red circle caution mark indicating that "the folder has already been used, so please use an empty or appropriate folder" appears.  I  have already been working on another project on trados at the same time. Then, I made a new folder, but, this time, the message "the folder does not have a proper path" appears. How should I solve this problem?

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