Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8b22a71f0516b4ec8b076f388beff4bd143d162c2374391c9ef4791bc42dbe49:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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