Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e8a45c12c17c2230647f54aa7830baab432f78d962b166e602219d20ebf1310b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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