Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 347cb2aeba3a45a5456afeed3a6329b0c3083eae2a05a98211d0b067ea944258:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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