Error in Adding Site

Hello All,

I am using "eclipse_knime_2.2.2" I want to install Text processing plug-in update.
I made the following steps as stated on the site:
After KNIME is started click File-> Update KNIME...->Add Site and enter the following URL:
But this error appeared:
An internal error occurred during: "Fetching children of KNIME Development Update Site".
I have also tried to open "Software updates" from the help
But this message appeared:
"Cannot Launch the update UI. This installation has not been configured properly for software Updates"
what shall I do to install text processing plug in

I'm trying to install it, too. But I can't find it!