Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 03b64b56c533ea5e1999d51ab4dddccd1f6131d47e6a6b65ff57c921e729f02a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^