Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e60ef361185c50ac898feae280bdcc34063cc147188153cb4acc7f2f28e7e08d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16