Empty space, where the slider should be (phone, tablet)

Error

Slider doesn't show up on phones, there is only an empty space, where it should be.

Solution

On Android phones you can make your phone write the javascript error in the default Android browser, if you open your website, where the slider doesn't show up, and write this into the url:

about:debug

then if you have at least one javascript error, in the top a javascript console will appear, which will write out the errors.

Other possible solution

Also this problem can happen if you are using JotCache, which puts <jot... > tags around the module positions, so if you use it, you can try to turn it off in the Extensions → Plugin Manager → JotCache and JotMarker, to see if that helps.

If you are a more advanced developer, this documentation could help more.