Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f31d488ab7c0477df41284ba3ad4807e1d6b72fc0d401ec88ea4122d887ad74e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^