Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8c81189ad3137b655e3dd01a985d08f6a92404c502b8ec2367bf475cd0e82994:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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