Missing slash in some link

Hi,
Since the last update, I'm getting a lot of these kind of messages in my dblog:

Plugin openlayers_behavior_zoomtolayer of plugin type openlayers:behaviors points to nonexistent file sites/all/modules/openlayersplugins/behaviors/openlayers_behavior_zoomtolayer.inc for class handler behavior.

Seems to me that a slash is missing inside 'openlayersplugins', but I could not find from where does this come.

Any idea?