Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7f79e9350f6e37efd01b11483f763dd86a6a407491830b6cf9c31c5c169d9ecb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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