admin - Magento2 : Update category, URL key already exists error -

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i have created new category , not visible in navigation menu of now.
adding products via code , working.

now editing category show in navigation menu, throws error "url key specified store exists".

i tried to:
unassigned products, throws same error.
changed url, left blank or changed value of url.

please let me know.

clear db table url_rewrite but! categories only. otherwise mess cms pages links.

after doing error should gone.


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