Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b6a383cdb65828a3c7d44ea51239a37e20bb7fbd8e458d1dc5efabaee7a30258:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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