Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1513ad0d040bdcdacadc4905b80fbc36528f4019a9b4cd795bb3bc49691fdec9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^