Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 670785858c1d852d76ae1d605d7e16b2a0906f8f41cc4ad1a453cb73b89c8bec:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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