Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ac1e8135c31a0781c706f6960b048ce84857948963ee28ebb6e3675a62980624:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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