Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0fb5ec8723971e2abbf7250e077d69d5731620a0f7528c197ff15c9e4ef5d317:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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