Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9daaec814c68a34cb483809467d61770c6abde7f76e0a209d5db480fddec06be:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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