Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> dd0a0fe70cb8705a314208ae13f8484c22834678e2101e46a75aad8f753540d2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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