JavaScript Error: Type;$jScroller.config.obj[i].ch

Subject says it all, suddenly I'm getting a java script error;
JavaScript Error: Type;$jScroller.config.obj.child is undefined

As always, thanks for the help!!

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Silly mistake on my part.
I'd moved articles out of the chosen Category (so it was empty) in the hot scroller module.
Hence, nothing was showing.
Is there a way of selecting more than one category in the module?

Thanks Ivan, appreciate the quick response and help.

As i see in code yes, you can put multiple category IDs separated by comma

More explanation please; where is "the code" and which line to alter?

Thanks

Noting in code to alter. Just put IDs of categories in content source field like 32,34