Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 276fca2f09f01101323f92a1eee7a83e2fdbafe8a0bb36dd151f325362258b0f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^