Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ed0eb3961e59ed5a35a9e3faabc5fb52032025eee0fcf1a7782841bbcffb7f96:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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