Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b51a1d7ee36a867d566ca4d1c5c384ddb38d1ce4c4df0c8379b54ab014fbecd3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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