Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2c8d012cb5caaf6cce4a1aff4fddf967b4ca608c06a0c0a5fdc7a9794dc26704:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^