Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a6d3ad1cc97932799aa6272061d73350ab0f56fe97f037cc1ef1152c7f6a20e1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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