Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 76bb270bc1ecca877ff41ba1d2ac497b994b0d088562a3429fd45b887fa1bf2b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^