Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a5561956234c2f71af44bbd8a2b702720ee7f0674223cfee2133a8394246114b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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