Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2184010f41ebfbbc5f48df9da57e8c7538b4450fcb307a5c93d0f3ca74eb38db:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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