Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ed5fcf6e75afa39bf4e2512dc3323d4a6a64f222dcf14e175dfb0eecd14c32a1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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