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Hey friends I am running my wordpress theme on localhost to make some changes. It shows following error without showing main navigation bar.

error:
Warning: count(): Parameter must be an array or an object that implements Countable in C:wamp64wwwfiverrwp-includespost-template.php on line 284 Call Stack #TimeMemoryFunctionLocation 10.0003404144main( )...index.php:0 20.0004404432require( 'C:wamp64wwwfiverrwp-blog-header.php' )...index.php:17 30.908112387632require_once( 'C:wamp64wwwfiverrwp-includestemplate-loader.php' )...wp-blog-header.php:19 40.925912455240include( 'C:wamp64wwwfiverrwp-contentthemesmarkutpage.php' )...template-loader.php:74 50.925912455240get_header( )...page.php:11 60.925912455616locate_template( )...general-template.php:41 70.926112455712load_template( )...template.php:647 80.926212456184require_once( 'C:wamp64wwwfiverrwp-contentthemesmarkutheader.php' )...template.php:688 90.927212470664wp_head( )...header.php:15 100.927212470664do_action( )...general-template.php:2614 110.927212471040WP_Hook->do_action( )...plugin.php:453 120.927212471040WP_Hook->apply_filters( )...class-wp-hook.php:310 131.027015883304markut_insert_fb_in_head( )...class-wp-hook.php:286 141.027015899816the_excerpt( )...index.php:158 151.027015899816get_the_excerpt( )...post-template.php:362 161.027115899816apply_filters( )...post-template.php:397 171.027115900216WP_Hook->apply_filters( )...plugin.php:203 181.027115901960wp_trim_excerpt( )...class-wp-hook.php:288 191.027115901960get_the_content( )...formatting.php:3308 About UsWe'r a dynamic teamLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod"/>

the lines of post-template.php are:
if ( post_password_required( $post ) ) //281
return get_the_password_form( $post ); //282
if ( $page > count( $pages ) ) // if the requested page doesn't exist 284
$page = count( $pages ); // give them the highest numbered page that DOES exist 285

This bug related to WordPress core bug
https://core.trac.wordpress.org/ticket/42814

Most often it occurs when you call the function get_the_excerpt or get_the_content outside the Loop provided that excerpt or content is empty.

So to fix it yourself you should find error place and check excerpt/content existing manually.

For example:

if(has_excerpt($post_id)) 
 $meta = sprintf('<meta name="description" content="%s">',
 get_the_excerpt($post_id)
 );