Thank you! Now it works fine.
I put an , after ‘post_type’ => ‘post’
if(function_exists('pronamic_google_maps_mashup')) {
pronamic_google_maps_mashup(
array(
'post_type' => 'post' ,
'posts_per_page' => -1
) ,
array(
'width' => 848 ,
'height' => 600 ,
'map_type_id' => 'roadmap' ,
'marker_options' => array(
'icon' => 'https://skatespot.nu/iconer/map-icon.png'
)
)
);
}