Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a38039d1d9667c8ef4c46a9cb8e3ece1d8b631f9700ed241fec3b1a850c7765c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^