Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b932417e61b784e4766fc58560c35c4882de1b38ab3a6ba4dfd5d46db69d608a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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