Lasso is a custom post type in WordPress. Because of this, it can't have the same slug/permalink as a post, page, category, tag, image, etc.
Every WordPress asset gets a unique slug including Lasso URLs.
For example, if you upload an image called "Long Pants," WordPress will create a slug called youwebsite.com/long-pants.
Then, if you write a post about long pants, the slug would be long-pants-2. I'm sure you've seen this before.
Instead of using -2, Lasso uses -link.
That just means you have another slug in WordPress taken up with the same slug. Either by an post, page, tag, category, image, or something else.
Chances are it's taken up by another plugin. So in the Lasso import system, we literally delete the original plugin URL from the database and add it to Lasso so that you don't get the -link thing.
It's an easy fix by just deleting the original item with the slug you want. Then, Lasso can use it.