Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4d8bb61fb5f6d68cf1647abd08c5633a5bd900b0cd6e2390241dc86eabc934e7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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