Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4c2b0c72fb0240f058f6b2531ad3fd06800611041c996de8b5d37f8075826658:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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