Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f5ce844182224872cf06d52f95c8e111b7318da90877a5ebf77ce4a0474bab02:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^