blog-types-config.php error

I just installed the blog types plugin. the db tables are there.
I am running this on a home dev machine....every other plugin has been seemless so far.
I get
Fatal error: Call to undefined function __() in C:\www\vhosts\localhost\_\wpmu\wp-content\blog-types-config.php on line 75
when I run the blog-types-config.php from the browser

line 75 is:
$blog_types_branding_plural = __('Blog Types');