Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 46624239c3ecfe1b0d1eab34c19843fbdac67fc21959d028ef8c75b46c43c90e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^