Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8c9853b3f3442f17951a85d72b9657eb31a97f6d498e6f3974967c599d60ad62:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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