Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5c9a2eb75385c0dd7485ececa4164ff8b14ee7ca61f38b559146499b1bc440ea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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