Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 60fcc838c6ffbab96c9fd6587a5f292d7465f63561bf4398676d5a7091048f3a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^