Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8b6b486f3e6fb8252872d3420a5f658e542362a520de0d9ecafa9090011162ff:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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