Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b745f02f46770c63cdafbbcd2c5c0f6de06ce6fec095fd543ae18c051d776895:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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