Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bd519aa598c4920b0ad77d39ddd1ac317614d2447e93b27cdaf28d290981ca07:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^