This plugin is using file_get_contents() to retrieve remote statistics. file_get_contents() is disabled by many hosting services as it can cause significant security issues. Please update the code to not use this function.
When building a plugin please always check the Codex to see if functions are already available to you. WordPress includes an HTTP class that is very robust. Instead of blindly assuming your function will work across all hosts, the HTTP class determines the best method to retrieve data on a per host basis. It is very easy to use. Update your code to use the built-in WordPress functions