It's difficult to be sure of the problem from this description but DarGUI 0.7.2 will not work with dar 2.5.0 and newer. Use an older version of dar or wait for the next release of DarGUI.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
It's difficult to be sure of the problem from this description but DarGUI 0.7.2 will not work with dar 2.5.0 and newer. Use an older version of dar or wait for the next release of DarGUI.