Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7081ff60cc15a929ab3503ef0269491465da26d9dbac4303d8f2200b1c1afb1b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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