VhostsEditorGUI.exe fails to open, Windows 7

[Toutouwai]

VhostsEditorGUI.exe fails to open with error...

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: vhostseditorgui.exe
Problem Signature 02: 1.0.0.0
Problem Signature 03: 54cd6d66
Problem Signature 04: VhostsEditorGUI
Problem Signature 05: 1.0.0.0
Problem Signature 06: 54cd6d66
Problem Signature 07: 38
Problem Signature 08: 50
Problem Signature 09: System.NullReferenceException
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 5129
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

[LiquidSebbey]

in Windows 10 errors when adding, editing or deleting. Also tried running as administrator