Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 841a2aa2b96555f25aeb7909c4cad2f3ccf4b8f8e29b3c28332ba2bfaa047a32:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^