Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eb2983ba658ef92544d3c555b6b287067bde75b41e743ad5ce5804ff18197d97:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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