Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 89a3cba14f5a8857c9d98dcacfe47212e71f3685e1250782def85fe64a643908:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^