Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4120ab5cc63b629f1bd4b17ac064fb6feea4f0127b0bb349e283ade5f469266d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^