Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5cd518717c5376e5ab65bc80e21ad2e68fe01f4d823fa4be81a06440e431fd9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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