Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 790fc3ab05ee6496e27fdad2445da544a9210a1ca00f06b6e16094aa3e210208:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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