Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fad3121c83a01810215eef77e29174ba1c2a0250d7d5b8e8e55c31dec88042d7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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