Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce5ba6cdc567271a8753ef2cbcf8c462a758f0ae0cab704f7f504dafaf844336:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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