Update Fluid composition in a loop

[cinarm]

I am using Electrolyte-CPA-EoS for hydrate Equilibrium calculations. Trying to optimize MeOH fraction to inhibit hydrate formation for a given gas composition. Trying to update fluid composition in a loop with "fluidComposition". It works fine if no ions are present. When I added ions (Na, Cl etc.) I had the following error. Is there a work around? Appreciate any help.

Error:
fluidComposition(fluid1, fluidcomposition)
File "C:\Users\mcinar\anaconda3\Lib\site-packages\neqsim\thermo\thermoTools.py", line 1040, in fluidComposition
testSystem.setMolarComposition(JDouble:)
java.lang.java.lang.ArrayIndexOutOfBoundsException: java.lang.ArrayIndexOutOfBoundsException: Index 22 out of bounds for length 22

Relevant section of the Python code:
fluidcomposition = [nitrogen,methane,ethane,propane,ibutane,nbutane,ipentane,npentane,hexane, WaterMolRate,MeOHCo,Sodium, Chloride,Magnesium,Calcium,Barium,Potassium,Iron,Hydroxyl,Sulfate,Carbonate,Bicarbonate]
fluidComposition(fluid1, fluidcomposition)
hydt(fluid1)
HydrTemp = fluid1.getTemperature()

[EvenSol]

Hi.
Please have a look at this Colab notebook and see if that can help:
https://colab.research.google.com/drive/1wl00wlWAJQw963RdYtlHTFc8sY2FYOXg#scrollTo=72dP_l_953yc

A simplification can be to assume the ions to be only Na+ and Cl-.

[cinarm]

Thank you for your quick reply. Did not help! Only works if I remove ions.