Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 45c2c0b700348d2bc285afbe9f091c1c60767c3edff5f3772de3d18cc5d7e09e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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