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If this is a verbatim copy-paste, you have this:

*
 * rosserial Publisher Example
 * Prints "hello world!"
 */

Note how the first line starts with a *.

It's very likely you made a mistake copying the example, and it should actually be /*, which would be the start of a multi-line comment.

A single star (*) on its own is not a legal character there, hence the compiler error.