Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a6b181f937d17b9d46db5fc5b252dabbabd3fd7d77d29eb198c9b81dd8d541db:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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