Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bc180b32a2e10702b417e8a2c0a1aa7cf990982c22b8a54ea0c5dee63cb1f4e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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