Desktop manager is not active.

[seppalta]

Sparky LXDE 4.52x_64 stripped down to just an openbox-session.  How can I get rid of a reoccurring popup: "Desktop manager is not active."

[seppalta]

I finally realized that the regularity of the popup was a clue.  I checked my cron jobs, and sure enough, one was set at the same regularity.  He was the culprit.   I replaced him with a different program and now, no popup.  Commands in cron entries apparently have to be very precise, as I remember now that I had this kind of problem before.