Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b011354848f9ef221769015adcf2d2bf2a9eb41095050dd5511622d7bcf23898:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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