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When trying to upgrade from 0.13 to 1.0.4 I get the following error.

Fatal error: Call to undefined function cms_join_path() in /var/www/www1/include.php on line 56

Make sure all 1.0.4 files are uploaded correctly, overwriting existing files.
In 1.0.4 on line 49 of include.php lib/misc.functions.php is included, which holds the definition of the cms_join_path function (starting line 151).

Regards,
D