Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fc35191d01f9cc30b4bd31faf5e5e3efbd9279f53cedef06a7c1ed189775a5f8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^