Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> efd835223c2d1fe76f302a5bc79b81ab0709d5394b4322b671a9121122472ef8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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