Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8bf1b129af321ea49cb560059b6b23146aface7c3fb6e47e204e2d8765a787fb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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