Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3c75b54407f07108265e717e88040a038eaf35c909e5238009018673ec77b1b0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^