Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0b7229f429effa9d341e6a36d0a1938fe2091d436131b15a5056bfddd12003a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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