Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2087021ce0d9634938247c4c0426a74d13716a5a53af89082c338a3bd061ba83:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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