Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ab8fe8e5faa5c8e93d96e36b48a0385e39374f9fb5cfcb35cfddf6187dc99d13:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^