Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0133a9230333eeee3544a0435e12a0d6ea2cc5fdff46d5e0ff0bceaa4d6bf221:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^