Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 571af807a36952bfddaf8e9e1b57ee9d3acf64ccdd1301af33edce7c7f050c44:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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