Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4b14003f29ff96735fe60fccf3a08d755d7c7c78ebd2b32a345657d94c8ef239:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^