Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c8040e4cd8c679e4dbfa1dfdc4474e5681e647c4ff0588a8b6abc0596a0752ab:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^