Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 736a9519e1f0067a092acdefe5c497106c161fab9d83de862d1e7747a463ceba:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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