Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ad3ef896e25f96e57016ab18f07a7b66280a4d904a66cdbfe66c443f1d4f6d3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^