Conflicts with Woocommerce endpoints

Ok, i solved the problem. Here’s what I did:

on faq-manager.php on line 125, change this:

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

public function flush_rewrite() {

		global $wp_rewrite;
		$screen = get_current_screen();

		if ( 'plugins' == $screen->base && isset( $_GET['activate'] ) )
			$wp_rewrite->flush_rules();

		if ( 'question_page_faq-options' == $screen->base && isset( $_GET['settings-updated'] ) )
			$wp_rewrite->flush_rules();

	}

——- with ———-

public function flush_rewrite() {

		/*global $wp_rewrite;
		$screen = get_current_screen();

		if ( 'plugins' == $screen->base && isset( $_GET['activate'] ) )
			$wp_rewrite->flush_rules();

		if ( 'question_page_faq-options' == $screen->base && isset( $_GET['settings-updated'] ) )
			$wp_rewrite->flush_rules();
*/

		return;

	}

That’s not really a supportable solution because when the plugin is updated you will lose your changes (and don’t use blockquote for code).

What’s causing the 404?

Apology for blockquote. I don’t know what was problem actually, there was something wrong with flush_rules() which caused 404 error.

I know that I’ll lose changes when plugin is updated. And I request plugin author to fix this problem in later version.