Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 85b164f2abe7dc6f67a8b0f65500ce46e4e1f65d6b7041218f28127f741dab2f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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