Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 507e8f432e179759815b0bc85efd5c5f4fe9342d7fc4ad86905e5c82ddf04a82:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^