Haha, i have the same problem.

Checked them all, Front, back, reverse, interior cabin, interior dashboard, trunk.

I'll just ignore the lightindicator for now. Changed the licenseplate for LED's more then a year ago and didn't get a warning.
And changed 1 of my parking lights in the front for LED, didn't change the otherone yet because its a pain to reach it.

Good luck with it!