Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1b566d398b8670bd8451e7e8f77f71185e044e1bc4b86e726f685ee58d014988:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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