HTTP error on uploading images to Wordpress 2.5.1

If you experienced problem with uploading the images in wordpress 2.5.1. Here’s the step by step solving tutorial:
- Make a notepad file. Name it test.txt
- Insert this coding to the test.txt

SecFilterEngine Off
SecFilterScanPOST Off

[...]

Updated to Wordpress Version 2.5.1

I updated my wordpress to the newest version 2.5.1 last night and it got error like this:
Fatal error: Call to undefined function get_shortcode_regex()
So, what i did was..downgrading my WP to the old version, then installing Wordpress Automatic upgrade plugin. Then Installed the WP upgrade automatically from that plugin. And yes, it works fine!

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