Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 12e66fe151bbb4f371e8e0f9a35c6fd65b19908c7ec69fb819f540e2523b46a5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^