I search through wordpress forum and google , it seem like this is not a wordpress bug because there are not many people talking about it, just some user mention it but without any reply, after few hour play around and looking into database & code level, finally i resolve the problem.

This happen after wordpress 2.3 release and introduce tag feature , the database structure has been changed, it combine the links category, post category and tag in one table, because for category slug it need to be unique, when you unable to change means the “word” has been used either by link category or tag.

The simple solutions is use another slug or get any tag management plugin to remove the “word” that you are planning to use as your category slug, i recommend use Simple Tags to handle the tag management.

I just wonder can’t the error message more meaningful ? it just like some stupid system design “This happen because of error xxxx0xxx000”

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One of the main feature for wordpress 2.3 is update notification, which will notify user when there are new core release or new plugin release, which telling you is time to upgrade, but some of the people might find this increase the load or privacy issue , that’s why these plugins been created.

• Disable wordpress core update
• Disable wordpress plugin updates

Another main feature of wordpress 2.3 is Tagging, like i mention before there are no features to manage these tags, plugins should be created soon to manage it.

Click Tags – a plugin that display all your previous tag, which allow you to easily reuse, but you will have problem, when you have lots of tag

Adv Tag Entry – a simple plugin that did some simple tag management

Simple Tag – a most powerful tag management plugin, it has lots of feature, it can help you rearrange your tag for previous post, my favourite

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