Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5b5774fa15e0b61cc0867a54015c459d24e928d1c61c0d2e416f227b018cd8d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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