I have got the issue when import the category for specific SKU.
General system exception happened Additional data: URL key for specified store already exists.
I have got the issue when import the category for specific SKU.
General system exception happened Additional data: URL key for specified store already exists.
This problem happens when you have product and category with the same url key.
Example:
Reference: https://github.com/magento/magento2/issues/6671
If above solution would not work for you. Take backup of url_rewrite
table, truncate it and run re-indexing and check again