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a blogger posted that they got this bx error code when they were trying to add an Adsense gadget to their blog.

One of the Blogger.com employees has posted that when someone gets a bx error code having to do with adding Adsense to their blogs one of the reasons could be that you have not yet given Blogger.com permission to add the ad codes to your site.

You have to go through that process first before you can add the Adsense gadget to your blog.