Can't use widget twice

The function is being declared twice when multiple instances of the widget are loaded.

Go to line 226 in twitter_widget.class.php in the controller folder and wrap the twitter_time_diff function with

if(!function_exists('twitter_time_diff')){ }

so you have

if(!function_exists('twitter_time_diff')){
	function twitter_time_diff( $from, $to = '' ) {
		$diff = human_time_diff($from,$to);
		$replace = array(
			' hour' => 'h',
			' hours' => 'h',
			' day' => 'd',
			' days' => 'd',
			' minute' => 'm',
			' minutes' => 'm',
			' second' => 's',
			' seconds' => 's',
		);
		return strtr($diff,$replace);
	}
}

Thanks. Now I get this error with the second widget:
Warning: Invalid argument supplied for foreach() in xxx\wp-content\plugins\wp-twitter-feeds\controller\twitter_widget.class.php on line 266

Anyway, the solution is this (posted by dariogene):

In twitter_widget.class.php change:
if(false === ($tweets = get_transient($transName) ) ) {
to this
if(false === ($tweets = unserialize(base64_decode(get_transient($transName))) ) ) {
and then change:
set_transient($transName, $tweets, 60 * $timeto_store);
to this
set_transient($transName, base64_encode(serialize($tweets)), 60 * $timeto_store);