Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2e90ec28393d1ca28fb8f01cbab4fad478eaaff5386fa76f57980153881b42cf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^