Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 522ac8ae3108a6eff773ecd41175b4e5e3008773b12e3ae7a5cbf34d13c1003e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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