Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ac31307d56144ee5ab6ffba3abfcc3ac23f94fd7d2e40824a7a98f6626831f12:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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