I think I am seeing that one too.
Is it affecting your browser session as well?

Have you installed Google Gears?

I have installed Google Gears now.
But Error is same.

Just after restart Windows, It was still error.
But after a few minuites It works without error.
Thanks.

tokita.toshi, thanks for letting us know. This was a temporary problem with the iGoogle gadget and we have just fixed it. Please let us know if you have any other problems. Thanks!