Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 38a0e4c90d0bfcc5862e3cfc6f1371993f7677a88b87fb01ea2937fad6f8da52:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^