Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3fc07ef541287ca4a0edba19ee518455f4b2aaf1dba4e109bd7ea932678ca6bc:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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