Please first active betheme after login on the wordpress dashboard.<br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/aheydari/domains/aheydari.ir/public_html/wp-content/themes/toptheme-betheme/functions.php:0) in <b>/home/aheydari/domains/aheydari.ir/public_html/wp-includes/pluggable.php</b> on line <b>1284</b><br />