Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> cae2f32a0b861f2f16daf425b8044621e3c20c1e81c3ba2ae86c5c41fa9ba485:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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