Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c27d701bde8fbbfc5b3b625214e7d724948b65441bb4616333f6fd3ad16cc823:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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