Starting with alfresco custom content tutorial for jeff potts

[hdalang]

Dears,,

I'm reading this tutorial : http://ecmarchitect.com/images/articles/alfresco-content/content-article-2ed.pdf
and I'm trying to understand this tutorial so I started by adding in advanced search the someco(whitepaper), so I have add to this configuration:
<form labelId="search.form.label.cm_content" descriptionId="search.form.desc.cm_content">cm:content</form>
            <form labelId="search.form.label.cm_folder" descriptionId="search.form.desc.cm_folder">cm:folder</form>
         <form labelId="type.sc_whitepaper" descriptionId="type.form.desc.sc_whitepaper">sc:whitepaper</form>

and restart the alfresco and it shows like on the attached picture(advanced search1), then I tried to add some labels on it and  it say

[hdalang]

Then I tried to add some labels on it and it say "An error occurred when the form was about to be displayed", I want to know what is next and how to create the other label, can someone talk in deep about this. I want to first to let it display the normal, and I have tried to do those changes but it didn't work, I have attached my share-config.xml in this message. my major is to practice on advanced search then to move to the others. I need some help.

Regards,,

[nikes]

check if you have followed this section for labels:

"Localizing Strings for Custom Content Models"

[hdalang]

Could you provide me with some links for this?

Regards,,