Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6b650866722addd0a07e3e044826b5ef50c0e248e263878a0367d6632cd67d62:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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