Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3546e0324b9210463f6b0faa7a9e14b7211710391716eb8b2e9f052b7bca3174:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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