Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f4117491a64a136fed6dabf260de5506e92f5faca2883646fd2dd920d7906e47:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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