Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0a2966fe612438fc87349afb4059ce4a2af2bb46da47f003d9bd9c7f3b2fb050:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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