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Actually, I later found out that doing this broke my job manager categories. Instead I suppressed the warnings in php.ini since I can’t find what anything that seems broke.

Hi,

I solved my problem so I thought I would post it here in case it might help someone else.

Changed wp-content/plugins/job-manager/frontend.php

function jobman_flush_rewrite_rules() {
	global $wp_rewrite;

	$wp_rewrite->feeds[] = 'jobman';

	$options = get_option( 'jobman_options' );

	$root = get_page( $options['main_page'] );

	$url = get_page_uri( $root->ID );

to

function jobman_flush_rewrite_rules() {
	global $wp_rewrite;

	$wp_rewrite->feeds[] = 'jobman';

	$options = get_option( 'jobman_options' );
	if (! $options) {
		$root = get_page( $options['main_page'] );
		if ($root) {
			$url = get_page_uri( $root->ID );
			if( ! $url )
				return;
		}
		else return;
	}
	else return;

and changed wp-content/plugins/job-manager/functions.php

function jobman_page_taxonomy_setup() {
	// Create our new page types
	//register_post_type( 'jobman_job', array( 'exclude_from_search' => false, 'public' => true, 'show_ui' => false, 'singular_name' => __( 'Job', 'jobman' ), 'label' => __( 'Jobs', 'jobman' ) ) );
        register_post_type( 'jobman_job', array( 'exclude_from_search' => false, 'public' => true, 'show_ui' => false, 'singular_name' => __( 'Tender', 'jobman' ), 'label' => __( 'Tenders', 'jobman' ) ) );
	register_post_type( 'jobman_joblist', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_app_form', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_app', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_register', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_email', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_interview', array( 'exclude_from_search' => true ) );

	// Create our new taxonomy thing
	$options = get_option( 'jobman_options' );

	$root = get_page( $options['main_page'] );
	$url = get_page_uri( $root->ID );

	if( substr( $url, 0, 1 ) != '/' )
		$url = "/$url";

	register_taxonomy( 'jobman_category', array( 'jobman_job', 'jobman_app' ), array( 'hierarchical' => false, 'label' => __( 'Category', 'series' ), 'query_var' => 'jcat', 'rewrite' => array( 'slug' => $url ) ) );
}

to

function jobman_page_taxonomy_setup() {
	// Create our new page types
	//register_post_type( 'jobman_job', array( 'exclude_from_search' => false, 'public' => true, 'show_ui' => false, 'singular_name' => __( 'Job', 'jobman' ), 'label' => __( 'Jobs', 'jobman' ) ) );
        register_post_type( 'jobman_job', array( 'exclude_from_search' => false, 'public' => true, 'show_ui' => false, 'singular_name' => __( 'Tender', 'jobman' ), 'label' => __( 'Tenders', 'jobman' ) ) );
	register_post_type( 'jobman_joblist', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_app_form', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_app', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_register', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_email', array( 'exclude_from_search' => true ) );
	register_post_type( 'jobman_interview', array( 'exclude_from_search' => true ) );

	// Create our new taxonomy thing
	$options = get_option( 'jobman_options' );
	if ($options) {
		$root = get_page( $options['main_page'] );
		if ($root) {
			$url = get_page_uri( $root->ID );

			if( substr( $url, 0, 1 ) != '/' )
				$url = "/$url";

			register_taxonomy( 'jobman_category', array( 'jobman_job', 'jobman_app' ), array( 'hierarchical' => false, 'label' => __( 'Category', 'series' ), 'query_var' => 'jcat', 'rewrite' => array( 'slug' => $url ) ) );
		}
	}
}

Voila, no more messages!

Same problem here with Job Manager plugin 0.7.20/Wordpress 3.5, haven’t found a fix yet. Here is the site: https://www.michanie.com/

With debug on and the plugin activated, the messages I see at the top of the web site are:

Notice: Trying to get property of non-object in /home/micha230/public_html/wp-content/plugins/job-manager/frontend.php on line 46

Notice: Trying to get property of non-object in /home/micha230/public_html/wp-includes/post.php on line 3586

Notice: Trying to get property of non-object in /home/micha230/public_html/wp-includes/post.php on line 3588

Warning: Invalid argument supplied for foreach() in /home/micha230/public_html/wp-includes/post.php on line 3588

Notice: Trying to get property of non-object in /home/micha230/public_html/wp-content/plugins/job-manager/functions.php on line 98

Notice: Trying to get property of non-object in /home/micha230/public_html/wp-includes/post.php on line 3586

Notice: Trying to get property of non-object in /home/micha230/public_html/wp-includes/post.php on line 3588

Warning: Invalid argument supplied for foreach() in /home/micha230/public_html/wp-includes/post.php on line 3588

When I deactivate job manager, all the messages go away. With debug off, when I activate I see the messages:

The plugin generated 148 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.