Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9ca0a01cf65436549064d242753f4d542e7fec331042c9c9110dbb71f21e01e0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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