libgdx- padding didn't solve black lines on tilemap

I know this thread is very old, but it took me two hours to figure out the solution myself. So in case somebody has the same problem in the future:

I noticed that only some tiles behaved like this - for example, a grass tile would, a water tile wouldn't. Even if they were used on the exact same position in the map. For me the problem was - apparently - that my PNG tile sheet's height was not a power of 2. A few days before, I added a line to an existing tilesheet and changed the height from 1024px to 1056px. After a lot of experimenting, I found out that after removing this line again, the black stripes would disappear.