Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5cfa32f88dfa7ac15a38de23bfcc2a1bdb02b7228ac6a9f76ac95fc010a049cd:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^