Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> db22f287bb1fdb6253bc9eaed33ca71255a6cf1c5ba0c9b11773d7a239a692e0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^