Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 5c39b46ed038e88353d8cb1df755d136cb860785cdb98d0ddaa32a7107378046:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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