Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7ae9c835d2d39f443ee7770b980fec1b4e180ccd076a41842da303d389e0dda8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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