Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8d557e833d29de37bb6ea45016b048dd95ffe5755c11a3bf18a1047afbbfc6f1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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