Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d1b9742c6e8a719cfddf5113c908fb456d1c10b007a9ba7b9c1b5062582d7eff:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^