Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fcdd4de3e51a0b66c9e1d945c1a862bfc81b9ba13354f176260c717aee1bbb12:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^