Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fca5df941c88aa7dd8388137082b0b2200cf61adc948a45ed030a33e75cf191e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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