Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dd3631739cdc73e03650fd1a6e1fb6172ffd8ea163dadd351b7ffcc984ae09b0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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