Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6756d1fdb4656f84fd8b055a709056b1ab6fdf68f53f69c6bd2baa28c3cd1984:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^