Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6619e3d21fa3d663ff82d64849e5e802f8e69c7271e1dafdb5f882e68a669833:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^