Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7765f7ee2753bb392f97cdda30ebc8b817b21323272a0c2648e955e57a7dd08d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^