Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ec4b7469c75a21dd399398afe70beb1903d5dc9965d2ad1afc1be64c52f0ff25:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^