Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c5db75c3b25ab9cebc32c24afd7fd663f64d1d06550bba2bdfc300b1742500fb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^