Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 33f283cbf63ff5c7a0e96b9722dcf81c3a94d4d705e24f754643bdbc20cdc4f2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^