Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 94bf85ac836fab88546f9f95499261354e94d44c60c83cbd25e1266384a54516:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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