Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 95358a5c8e7ef07408fba175b89df2da94e30783420b86975e4d9ddb4639ed00:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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