Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fac321fc73fe716252bd7f184547063c0b24dcdb7d9c9ad5d2528ee74d17c5cc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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