Cant Activate Plugin

When i try to activate the plugin i get this error:
Plugin could not be activated because it triggered a?fatal error.
Parse error: syntax error, unexpected ‘:’, expecting ‘;’ or ‘{‘ in?/home/inver625/public_html/wp-content/plugins/daily-prayer-time-for-mosques/Models/DPTHelper.php?on line?73

please help, im kinda a newbie with wordpress, but the masjid wants daily jammat times widget on their homepage, if you want i can DM the author my login details