Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 77f356acbc1a5a7c8ba79a8aa365c006b75f1db82f0ec25b132f208e5ec77acf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^