Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3fa6b410a218ee88e0e12fd6ecc9289cecca6e10df198d2c8cc309536b7127e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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