Magento2: Errors installing Sample Data: Class “\Magento\SampleData\Model” not found / no commands defined in “sampledata” namespace

Question

I am trying to install Magento2 version 1.0.0-beta.

I followed instructions about installing sample data from: http://devdocs.magento.com/guides/v2.0/install-gde/install/sample-data.html

I enabled sample data before installing Magento and at the end of installation, I got the following error:

Error during sample data installation: Source class "\Magento\SampleData\Model" for "Magento\SampleData\Model\Logger" generation does not exist

I then tried installing sample data after installing Magento. I am getting the following error while installing sample data after installing Magento:

[InvalidArgumentException] There are no commands defined in the "sampledata" namespace.

Answer 1

Had to delete old magento2 files and directory & redo the whole thing.

• Deleted the whole magento2 directory
• Cloned magento2 again
• Enabled sample data before installing Magento2
• Installed Magento2
• Finally, done!

Magento2 installed successfully with sample data.

Answer 2

Did you download version 1.0.0-beta from the releases page (or master branch), or off of the current develop branch?

My understanding is that the develop branch is not stable/sample data won't work, but it should be fine if you're using the official beta1 release. You can find that here: https://github.com/magento/magento2/releases