Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 584d3f4fe2b2133bafa423e14d8e85b4d1336082a4033430ccaf62af83a55c4f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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