Led tail light errors

[Yii]

Hey guys iv searched for ppl having issues with the LED tail lights and the main issue would be from the flickering which is solved by adding a capacitor. I got my capacitor from Lightwerkz and purchased a LED tail light from Ebay(Spyder Auto) and from what i can tell i hooked it up right. I connected the Red(+) capacitor to the Red Wire and the BLack to black. Makes the tail ilght light up real bright and flickering is gone. But when i am not on the break pedals i get an error for check break lights and when i am on it the error disappears. Is this normal? and there is a 3rd wire which is the green wire(ground i believe) on another post someone used that. i am not sure i hooked it up right now