Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0317ba38c4cd70551c1236210c2423d8a62d50bf5337645da06f46f909dadd55:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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