Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ae33aaa12b1eb5aa6e9381b3d6ead633803a86606bbfdd6d1b71759b3c0ee01d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^