Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0d116ccd1bc0da1f0ead99570a58e781a8397395f0befde3906daba84d592c37:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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