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Trying to upgrade an existing site built on Joomla! 1.0.15 to 1.5 due to some Extensions that I want to add. This process showed to be extremely error prone, even to the degree that I question that this process is tested properly!?

It´s obvous that it works for some people but it makes me wonder what exactly i´m doing wrong as i´m following the tutorial very closely.

This is what I did:

Downloaded the whole existing site and database to my localhost (XAMPP 1.7.2 on Windows Vista)
Installed the Migrator 1.5 extension and ran it.
Created a new folder and a new database for the 1.5 version.
When running the installation process I get error messages like "Deprecated: Assigning the return value of new by reference is deprecated in C:\xampp\htdocs\yourmail_new\libraries\pattemplate\patTemplate.php on line 1424" throughout the whole process.
In the final step I added the SQL-file from the Migrator extension.
Removed the "installation" directory.

Result:

The start page says "error 404 (missing component)"
The backend works but none of the modules or content from the old site is included
Lots of error messages are showing, for instance in the Module Manager: "Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in C:\xampp\htdocs\yourmail_new\libraries\joomla\html\html.php on line 87"

Things I have tried:
Installed the mtwMigrator in the new site and it seems to include some of the stuff from the old site. Front page still not working.
I have run the process over and over from the top but there´s not much that I can do different.

The only thing that I see left to do is to completely remake the site from scratch in the 1.5 environment. Please tell me that I don´t have to!

Downgrade Xampp to 1.7.1 as Joomla 1.0 does not work with PHP 5.3. the older version of Xampp has PHP 5.2.x. The latest release of Joomla, 1.5.15 is the first version tested to work with PHP 5.3.

Oh! Didn´t know that. I´ll try it and get back. Thanks!

OK, tried to downgrade XAMPP to 1.7.1 but the result was exactly the same. Any other ideas?

Can this migration be done manually without the dependence of these modules? Is there any information out there of how to do this?

I am unclear as to what you are doing and where the error has occured. You downloaded your 1.0 site and installed it on Xampp? You install the migrator in your 1.5 site? The migrator installs in your old 1.0 site, you follow the tabs and select the settings you wish for the data dump then you create the dump file.

You then install a new Jomla 1.5 install and during the process you install the dump file to migrate the old site. Do not reuse the dump file when migrating rather use a copy of the dump file as the dump file is altered during the migration on the new site.

1. I install the migrator extension on my localhost site (Joomla 1.0.15)
2. Run the migrator and dowload the SQL dump
3. Install Joomla 1.5.14 in a new directory and new DB
4. In the last step I include the migrator dump file

Joomla says everything is installed fine even though I get a bunch of error messages saying functions are depricated and such.

When I go to the admin of the new site nothing from the old site is there, pages, modules or menus and the front page displays an error 404.

Strange?

I then install and run the mtwMigrator extension. Some of the content gets imported but there´s lots of error messages all over. Front page still says error 404.

The deprecated errors are because you are using Joomla 1.5.14 with PHP 5.3, only Joomla 1.5.15 will work with PHP 5.3.