Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b2c25acaf8c1c223420ff3b5e91883db4c077a27591c6ebdc27c8b3c69ccfbb6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^