Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f083210fb264657b629a707b2501b6c1b2afc0661356761b6f8c026021b95329:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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