Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8d7e8ee78f64f905481099d9350ac9522c3b593ca85f438893b4fd3b3a87dd29:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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