Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2cb02f03155e50aba9be5c5d19ec1a285bf19d263b589c2e7c4bfbd6281e7847:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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