Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f721d6dc2cc894e0c2bbb235906ca3067b7c2a22da6963e5f476ea364856b629:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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