Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f03a3bdde925464c7675f1081747fc0c6f7d49e1220ff3d8a09a6d8ccdf6624b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^