Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 67abe800536f5cf1f4d96d46420d1e0ebe5d15a5115fb85b07ebdf6ea6a37c92:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^