Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c820c6fbea88f476956b704d1e455aef1b84e8c923951e98ea3361f413aa48f2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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