Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f623d5aea59bd299dbd3ba4b66dc6ad4b2fff2795f2654cff1f16b8266cec2cc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^