Hi I need help with my tail light I changed it 5 times and it still say in my dashboard that is no good please help

What is your question?

My 2011 ML350 has a problem I changed my tail lights all of them and the car still say that it’s no good it works sometimes and then it turns off what can I do please help.

What makes this problem better or worse?

If my light switch is off my brake light work when I turn the switch on at night to drive it say tail lamp is off

How long has your 2011 Mercedes-Benz ML350 had this problem?

Like 2 months