tyPreview Maxscript Error

[usc001]

Hello, 
i get an Maxscript Error when i try to open the tyPreview Window. See attached file. 
I always use "Tools menu -> preview - grab viewport -> create tyPreview. 
When i hit "Create tyPreview" the Error prompt comes. 

It used to work perfectly before; i used it all the time!

3Ds max 2017 SP2 
tyflow v0.16089 
vrayNext 43000 

I tried reinstalling the plugins - same error. 
I restarted windows and tried in a fresh Scene with only 1 Sphere; same Error. 
Can you reproduce this error? 

Thanks in advance )

Edit:
i just read the pinned post on how to submit bugs.
However, this is reproducable with an empty Scene on my PC.
Would you still need me to provide the max Scene?
Thanks!

Edit2:
This is output of maxScript listener:


-- MAXScript MacroScript Error Exception:
-- Type error: Call needs function or class, got: undefined
-- MAXScript callstack:
-- thread data: threadID:624
-- ------------------------------------------------------
-- [stack level: 0]
-- In codeblock macroScript: tyFlow_tyPreviewWindowMacro; filename: C:\Users\moritz.horn\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\usermacros\tyFlow-tyPreviewWindowMacro.mcr; position: 107; line: 3
-- Locals:
-- tyPreviewWindow: undefined
-- Externals:
-- ------------------------------------------------------
-- [stack level: 1]
-- called from top-level


Also i can reproduce this on all machines in the office!
All have the same software configuration as in my OP.