Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b903f5f1b8e90d21ff557b025942d35cb01b06b39d52d2cddfa410d4a9fb1e8f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^