Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0d1ba7aaf61c2c796c65420e88d8c117fb9c70b99bc6ffce9a99098c27c28cef:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^