Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3b109f1e6bfb6a4dd5c1bb8991609512a8832bec15b26b5f06109de21371238e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^