Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f1a12afcb57b0d2e24e6a4a1db4d26e8639f2145cbadbacc9712c086be9661d8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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