Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1dd6dcfdb9aec9d7fb36b94c5ed939d7f8ff51079469049aa5d6ee0a887d32b8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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