Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 733b32465dbfa8a67491920c491199f0126408b11cd39393f6255aa98ca15e3f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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