Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 59ea19d34560415fc5bd6c164486b601e102f63c48e44fd475560a1ae9814935:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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