Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd28779fcafc7bb518458766ecccfa4956c6fd755c9bbe1886adaa87fa497a81:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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