Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2336f4c568a308086543f0ebcced11ac44f1a60db969cce7f75c3eb8ea466c6b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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