google maps marker.png 404 error

Markers are not showing on my Google Maps. I looked at the Java Console and this is why it's giving me a 404 error:

http://www.windingcreekchurch.org/wp-content/plugins/wpmu_dev_maps_plugin/i…s_plugin/img/wp-content/plugins/wpmu_dev_maps_plugin/img/system/marker.png 404 (Not Found)

Ther'es some sort of extraneous i...se_plugin being sent to the URL. The marker.png file is in the img/system directory but somehow the URL is being re-written so it can't be found to display on tha map.