Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c51458857db0f74132df68f4c4eb3e0e12d9458781864095792bf97051a00b44:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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