Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 80171ae235229406eea8dc2d4bfdfc537c7d6a9261ea39a153cbfa77cc110a25:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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