Apps.ThemeBuilder

When installing the app/module into version 5.5.4 and create a new app using `New-PSUThemeBuilderApp` I get the following error at the bottom of the page.

"The term 'Convert-HashtableToString' is not recognised as a name of a cmdlet, function, script file, or executable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again."

Also when trying to expand either light or dark options under 'Color' I get this error.

The term 'New-UDPalettePicker' is not recognized as a name of a cmdlet, function, script file, or executable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.