Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b23e79a8aac496542a239ac2d1200a2a7566d4ff6c1b53e34fd58a4dee452a71:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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