Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7ed5f930275c6e56ae6141ae2911c383a411168c377de49d76ecc9c430485403:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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