Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ddb0112d9ea02fb624cb50d594f2a0c180b57ba689e5e0dbda75eceb508fe785:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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