Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fb3f81a1aa74b53bf5fd6b1fca2acd4f2dc06ebb0183b1ddf622a06f6d3fa867:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^