Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7bb2c1b05cc437813e650c7a10d8403c52b82445241176027ee368319b8ef75a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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