Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 68cf3d77088e96cc07e4830e9dfe1d6a42e83c9e846d4880661a78c38593f29d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^