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The first line gives the answer.

When you download the Git repository the arduino library folder does not include the node_handle.h file (which is silly!)

Go to the serial client file and copy the 'ros' file and paste the into 'ros_lib' in the arduino library file. That should help the compiler find the file.

I found this thread because I had the same error. I did the above and I was able to solve the "‘NodeHandle’ in namespace ‘ros’ does not name a type" error.

Unfortunately... there are other missing files to gather...