Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1bd8ee239b78df1e499bad9582950cc76a6eebb3c7e6ef3caba329053a235198:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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