Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a3309a44e44be877e1cf118ddf3f5aa22c57df490f9d1af884e9aaae754bd683:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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