Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2ab7ff6d1e9c3aafaae479fe4ec893842fd4ca26e35e9bd679891fc93155e80b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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