Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1f41c4fef776019fa6a0b0d55d0ea3ae6d78d1b8e125041b01bb8bb68ad9ecec:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^