Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f2f9aecf50c2002dd53ce58e092a9daecb7a957a54b5dccc1340f668cd7112fa:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^