Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ca989a740549d50c0867c66362f453e9310a7312afd3e41ef96bd946e0a240dd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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