Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7829bdb567914740902ad4c189f35b058fdb3cb4e711208b24b2407b6641c6a9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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