Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2b10d7c484326dff2b1468d11d568db7926a46ea7d1c99fcdb7da9fe7fa01e59:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^