Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e847fa282c75d065ed8c502b2117f392ce7e14a0f6b6aba25bb8201375498235:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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