Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ff19f25d306e279ba8b2bd5e0f9db2d81c97deccc0dd9aca5533c4b65d5ae5e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^