Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e39cbe9004cd0d288d43b51cdedbd07e4c6dcb04c207c931aeb340324b5a630e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^