Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 03d9f3580b7915e3a025eb45e15d7548b247fa310989b1dbe67c23a7f74c51f9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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