Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a296ab6805617f4726f39e9535dc43154aec7cad918bad4f3561879ad2dfa5ba:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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