Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 437fb299fe62dc68f52d523bbe12ee6e3bf71a67b97582bc2e8f3b9c71cf7f04:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^