Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1cea5e4c386a97ad1555023e2760d15194fbf2dd3740130601a8e5d515f532d7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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