Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1df7cb8c4580fb2d3f1e153cc8a2dba87a24012ba5bbde13b0981c3faf32f750:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^