Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4f17cfe4131a3a7bba764f14bd11b238e6cc260d03d893a0b04a4d47c80dd59f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^