Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c0e82837ea9e6a34bb3365c79f64b0d4034c0cfb52e6a53e246a9c10fd619b92:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^