Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 22ac1e78dfa799281791f5f133784050d2436c70db5655c89ff7d78b37250f92:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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