Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc21653724ce6ffbc99f86410c11a69ee9a548c4bdfc948d49968477d95d0a5b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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