Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 350ff49662c18275a7dbd6b94f78b44f27e8b06bbe34ba5bb895d60c4d002298:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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