“ERROR : options page not found” – while saving Settings->Reading->

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Hi all,

I’m getting a strange error while saving the Settings->Reading page (after changing “Blog pages show at most”)

On submit, the url getting changed to /wp-admin/options.php.

When I check options.php page I see the following.
`if ( !isset( $whitelist_options[ $option_page ] ) )
wp_die( __( ‘ERROR: options page not found.’ ) );

though, I don’t have any clue on what to do.

Kindly give some advice on how to fix.

Thanks

PS: I’m getting another warning the top of Dashboard as given below
Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘__CLASS_’ not found in ***/wp-includes/class-wp-hook.php on line 298