Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4ce08b4d067147668a83597dcec52e96c57cc838162e9ba86017a592c8018650:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^