Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 650de3cab94d14489a1501ded69f854bcd259ebca640c41150e13d1a4f1a3f0c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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