Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 18c4f953efdfb758098d36125fd28e46fc5edc2784123dff59ce1c4f9ea9e15c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^