Omni completion (^O^N^P) Pattern not found

I recently install javacomplete[1] and easytags[2]. Its structure is as below. However, when trying completion by pressing ctrl+x ctrl+o, message bar display

Omni completion (^O^N^P) Pattern not found

If removing easytags, then javacomplete plugin works again. How to fix this problem? Or any other alternative suggestion?

Thanks

javacomplete version is 0.77.1.2
easytags version should be 3.1.5

autoload:
javacomplete.vim java_parser.vim nerdtree.vim Reflection.class Reflection.java xolox

doc:
easytags.txt javacomplete.txt NERD_tree.txt tags

lib:
nerdtree

misc:
easytags

nerdtree_plugin:
exec_menuitem.vim fs_menu.vim

plugin:
easytags.vim NERD_tree.vim

syntax:
nerdtree.vim

[1]. http://vim.sourceforge.net/scripts/script.php?script_id=1785
[2]. http://www.vim.org/scripts/script.php?script_id=3114

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