Pagination not working 404

My pagination is not working, it only displays the current page 1 when clicking 2 or 3 .. I get 404 error, below is the code :

$paged = (get_query_var(‘paged’)) ? get_query_var(‘paged’) : 1;
$args = array(
‘post_type’ => ‘estate’,
‘paged’ => $paged,
‘posts_per_page’ => $showposts);

When I change 1 to 3 for example, it shows the third page correctly and clicking page 1 (only) also works fine but clicking back 3 I get 404 error. As:
$paged = (get_query_var(‘paged’)) ? get_query_var(‘paged’) : 3;

Any Solution please I spent 3 days googeling.

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