Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c71db193b0f306ce1191a94d58a2f88131e1e52c6642170147f3bbb567448280:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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