Join Array Function not working

[Elanhere]

Hi there, the output of an aggregator (module #82), I am getting as an array with values C, F and S as you can refer in the screenshot. Now in the next module #83, I need to concat them as "CFS" (preferably without any separators). I am using join function, but its not working. Please help!

Module #83 output is empty as follows,

[_Manish_Singh]

Try this:

[Elanhere]

Thanks Manish, Is there any option for me to remove comma separation. 

[_Manish_Singh · Accepted solution]

emptystring should work for you. Have you included it?

[Elanhere]

You rock Manish, I used emptyarray instead. Now it works!