Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cd613eff026722be657afabb8c83f8d71213910c6673c32a014d6ad3743a1a7d:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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