Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 163b1f3904d71607171af03aa3c1c36f8ab1f6ef74f0f6cd593314cd810997b3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^