Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4ab87e64a54182b6d02b4cf3807b3d694db5b29135a8fd0428baf01a4c2a2a18:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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