Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 81852cf5f1afff50160d90b1da9f7b822d7a9dd2264d9ee3fb0865f8544cc29b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^