Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ccf063ee3db2e42a45fc4f792bcfdbc987d53ef2c592710c1c9491125fd247b3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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