Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b363f6acb4cdf5d4b5450721bc2e5ff6a985c9b6e21a2f59f5afead2e9127ca2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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