Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3faac48fe5648e32fa1c319605bbe29c269ff54d7b585745cba2d3edebf1dc00:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^