Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c6bd356f9d69cdc793e95aba3cc95d7da6f5a558e20ad3f6d3f65f89316c8d37:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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