Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a681f01aada604010b6c5459c4b3862abee5f7e9825f7ac72f7ef89fac0efb48:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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