Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> feddb4c2b8f5475addac039f1eb5c545d6caae4d4ceec6a6074418ec11489176:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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