Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9080c81e8398abad9bc575d06665b46c0072befb86c789b353a9c03a807dc29:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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