Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1379b5f6c13ec84dcb850e22a44e1faafd0af491c66a28206604f47106f5e993:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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