Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 00a4344c3fe334e2f7091ffe3e2acbccd3ec4ab215495811b774c0ea7acab91f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^