502 error

Hi,

One one of our sites witg the Pardot plugin, we get this error message:
Notice: The called constructor method for WP_Widget in LayerSlider_Widget is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/1/75763/www/wp-includes/functions.php on line 3916

Notice: The called constructor method for WP_Widget in dc_jqaccordion_widget is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/1/75763/www/wp-includes/functions.php on line 3916

Notice: The called constructor method for WP_Widget in dc_jqaccordion_widget is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/1/75763/www/wp-includes/functions.php on line 3916

Notice: The called constructor method for WP_Widget in WooSlider_Widget_Attachments is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/1/75763/www/wp-includes/functions.php on line 3916

Notice: The called constructor method for WP_Widget in WooSlider_Widget_Posts is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/1/75763/www/wp-includes/functions.php on line 3916

Notice: The called constructor method for WP_Widget in WooSlider_Widget_Slides is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/1/75763/www/wp-includes/functions.php on line 3916

Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method dc_jqaccordion::header() should not be called statically in /var/www/1/75763/www/wp-includes/class-wp-hook.php on line 286

Strict Standards: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion.php on line 36

Strict Standards: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion.php on line 37

Strict Standards: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion.php on line 38

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

Deprecated: Non-static method dc_jqaccordion::get_plugin_directory() should not be called statically, assuming $this from incompatible context in /var/www/1/75763/www/wp-content/plugins/jquery-vertical-accordion-menu/dcwp_jquery_accordion_widget.php on line 248

We disable the plugin and averything works fine. Why?

Glenn