Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d9aad4ee32657c444b95b75c1da5767ea312379c64de3ed36055bd30f04cd20e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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