Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 56655dbafc0a481e3d3e05d9d35fe537824eb806b3daed1a9c85e604f9bb8393:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^