Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1bb713595eedd4395538fd3661051a6169bcc5cf257da4374072104295222d64:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^