Is someone using that tool? I use the 10.2 version of Arc GIS and I need that tool, but I still think there is a bug. For using that tool I need "Vereinfachungstolerenz", but there is no space to fill that variable. Without that toleranz that tool does not work. I couldn't start it.
That pic show the problem.
The option is definitely fixed in version 10.3.1 + so you may have to check the bug list to see if it is fixed.
There is always an "issues addressed" document with each version link Patches and Service Pack - Esri Support