Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dfd4bfb1c8888f2f82e7f3e1de2cb0bf66bc160c13e5e13f83d84403e0994bbc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^