Worpress Pluggable and Post Error

Warning: Cannot modify header information – headers already sent by (output started at /home1/hdwallp2/public_html/wp-content/themes/wallpaper/include/adminPanel.php:656) in /home1/hdwallp2/public_html/wp-admin/post.php on line 235

Warning: Cannot modify header information – headers already sent by (output started at /home1/hdwallp2/public_html/wp-content/themes/wallpaper/include/adminPanel.php:656) in /home1/hdwallp2/public_html/wp-includes/pluggable.php on line 1121

When i post anything new or uninstall any plugins i’m getting this above warning.

Can you guys please help me out with this.

Thank you!