Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bf346e5efb4209e93885850b1cfaad42e634ab8d8c87843315851d7ce7d5a463:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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