Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 63bdb246492b10c3c805ecdbacf4e71ae55bf1c46b8455ab6e2ff04a91b1b49f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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