Not able to edit articles -> ContentHelperRoute not found - Joomla! Forum - community, help and support

hi guys,

i have 2.5.6 joomla jreviews installed.
before updated 2.5.3 , jreviews express general.
somewhere down line lost possiblitity open/edit or create articles.
when click edit gives me blanc screen...

it gives me following errors

notice: undefined property: jobject::$category_alias in /var/www/html/administrator/components/com_content/views/article/view.html.php on line 49

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checked not jreviews...anybody, please?

notice: undefined property: jobject::$category_alias in /var/www/html/administrator/components/com_content/views/article/view.html.php on line 50

notice: undefined property: jobject::$parent_id in /var/www/html/administrator/components/com_content/views/article/view.html.php on line 50

fatal error: class 'contenthelperroute' not found in /var/www/html/administrator/components/com_content/views/article/view.html.php on line 53

the rest of site working fine.

please help.

help...