Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ebe4c38782a474eff3a5d01195036e79538536734c50538c887331c726a2d483:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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