"Select Language At Signup" activation failed

Download Languages for WordPress & install as instructed (wp-content/languages has all the*.mo files). Download “Select Language At Signup” and install. Error occurred when activating:

Fatal error: Call to undefined function get_blog_details() in /home/tonyly/public_html/vietonlinetv.com/wp-content/plugins/signup-language/signup-language.php on line 125

Please advise what to do…