Theme - Galashopmore

Below are fixes needed. This is no guarantee solution, as you may have some even newer or modified version of theme.

In case solution doesn't work for you „Professional extension installation“ services will be required, so our developer would fix it all for you.

Open app/code/community/Gala/Shopmoresettings/Model/Observer.php. Insde changeLayoutEvent() method find the following code:

if(($type == 'layerednavigation/catalog_layer') && (!Mage::getConfig()->getModuleConfig('EM_LayeredNavigation')->is('active', 'true'))){
    $type = 'catalog/layer_view';
    $template = 'catalog/layer/view.phtml';
    $name = 'catalog.leftnav.custom';
}

if(($type == 'layerednavigation/search_layer') && (!Mage::getConfig()->getModuleConfig('EM_LayeredNavigation')->is('active', 'true'))){
    $type = 'catalogsearch/layer';
    $template = 'catalog/layer/view.phtml';
    $name = 'catalogsearch.leftnav.custom';
}

and replace it with the following code:

if(($type == 'layerednavigation/catalog_layer') && (!Mage::getConfig()->getModuleConfig('EM_LayeredNavigation')->is('active', 'true'))){
    $type = 'catalog/layer_view';
    $template = 'catalog/layer/view.phtml';
    $name = 'catalog.leftnav.custom';
    continue;
}

if(($type == 'layerednavigation/search_layer') && (!Mage::getConfig()->getModuleConfig('EM_LayeredNavigation')->is('active', 'true'))){
    $type = 'catalogsearch/layer';
    $template = 'catalog/layer/view.phtml';
    $name = 'catalogsearch.leftnav.custom';
    continue;
}