Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c28640e80eb249c0b8522dd32eeebc582607224da961c50a47956f9acf9e2775:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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