Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ed46a3b0e75caba43a444b69dcfcf1f3eb41b19865b5e4c0b1841728a8cc14ea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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