Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d8f9e0ea792183ce03c4e356c4013810a00c559ccca0ee6b3de24dc19147f07a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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