Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 61c720fbb1776f012b00c5b509db88ba85d7c0aee8dd59f89dc44ce328e05fd9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^