Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c09c8fd5674b0bf9e73fee51f01c1cf551efd06da273c2b478941731d733a3f6:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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