Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3027c9675a2b6f41a0172b8530e4abeb9b580e13437e0170e6504e45bf34c8a5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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