Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7186cf63fbdaecbf00cf2ff5e3bb08d285af7439663185abfeafdb094575e2ad:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^