Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9e3fee04f7e3df72e75e26c851efdf7300be464326510c6ac1ba4c0d3883809a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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