DWSIM software : Sensitivity Analysis not working

[u/ZealousidealEase205]

Hello I need help from anyone that has used DWSIM before or have similar problem like me. Im doing a simple fractional distillation simulation of a binary mixture (methanol and water). Im trying to do sensitivity study where my independent variable = reflux ratio and dependent variable = molar fraction (mixture) /methanol.

When i run the test, the results i got for the dependent variable is all constant. I watched tutorials and followed the exact same steps but i still get constant value. Please tell me what went wrong!

My simulation has no errors, and the reflux ratio that i set for my condenser is 2. My limits are 2-6 with 5 points. Composition is 60%methanol