Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5c99eda0a7a836df8b93612eff0dcd94a2e6f7ed175cd25e0258c31ce375d17f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^