Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f5c3e366ff76ff1775d501b943db401c23eaeb98cceb3eca42ebcaaedbb3e09b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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