Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 48c9188f7bb5f6c13e207ed747fcf12a9ee42166c420066fa4110bb42f71b883:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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