I currently have the following issue. When I try to open an integration file in Bartender Integration Builder I get the following error:

The error code is in Dutch but it roughly translates to; 

Changes failed;
Value cant be null

Afterwards when I click OK it does open File explorer but it gives the error message everytime I navigate to another directory. 

Bartender is running on Windows Server 2012 R2 and where using Bartender 2016 R8 version: 11.0.3153

Does anyone have an idea how to fix this error?