Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 22a6d3fd43afb39c1b2c1cab372d4428be53e585c68d3c6a93244f0eb4b23532:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^