Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cbd0d95153a849c20714d0c822c418f02d8b1de303704c6e0aec935d5317382e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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