Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5753194a226392d247a6c34cf8fd2490cc63a1080f6b0db1afceadc134d0dfa:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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