Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 60b665dc871ce0dff89b78393ac4517f107af032ed23c1ca9e4aaca98d50d1eb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^