If you see a message like this after installing OptimizePress:
Notice: Use of undefined constant OP_SN – assumed \’OP_SN\’ in … /wp-content/plugins/optimizePressPlugin/lib/framework.php on line 494
Notice: Use of undefined constant OP_SN – assumed \’OP_SN\’ in … /wp-content/plugins/optimizePressPlugin/lib/framework.php on line 495
How to fix
Normally in cases like this is caused by having debug turned on in WordPress. As this is a php notice, it is not effecting any OptimizePress functions, however the reason it shows at the top of your site may be due to havnig wp-debug turned on.
This would be in your wp-config.php file.
See here for how to turn this off: https://codex.wordpress.org/WP_DEBUG
Basically look for this: define( \’WP_DEBUG\’, true );
and CHANGE it to this: define( \’WP_DEBUG\’, false );