Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fc539df1d6ee5f316553d3138faa31ab2c3c5ed5e82f431ced28eba8a2e0d332:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^