Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> aa7fc32528d26867735fb0768d0019e34e7369d05f59719243bfd189a617c88a:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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