Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0f4b6c8fa2d7279e57dca7d1449f53565e6608135d746bf957721c4d1ccdfb18:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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