Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1c60022eed6ca81c1f2733159b7ef03a3a7deaa616759aed833afc488bf596a1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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