Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e4d5011d54e6e1d80c4c0168ff0f6fdb385b4b95bc4d5259f8bbd91defd14739:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^