UiDemo Walkthrough Assign Problem

@trixy and @bogdan.nastase
were you using UiPath Studio 2018.1.0 to run the workflow InitAllApplications? I have had some issues where 2018.1 doesn’t work, but 2017.1.x will work.
I am still stuck on this part with the InitAllApplications. My Config.xlsx has the right permissions, so I don’t think that’s the issue. I have tried the solution in this post, but I still get the NullReference error.
I have run the InitAllSettings workflow with a writeLine "out_Config is: " + out_Config(“UiDemoPath”).ToString, and it writes out the correct path to my UiDemo.exe.
But trying a writeLine for in_Config in the InitAllApplications workflow always returns a NullReference error. Any other ideas?