Possible issue with custom module

[antiseptikk]

I try to create a little module (just display Hello World) in dev RC and when I return on the home page I got this message:

Setup version for module 'Magento_HelloWorld' is not specified

Do you know how can I fix this ?
Thanks

[vpelipenko]

@antiseptikk, your new module should have etc/module.xml file, where setup version should be specified.

[antiseptikk]

@vpelipenko i have etc/module.xml with :

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">

    <module name="Magento_HelloWorld" setup_version="2.0.0" />
 
</config>

but i got the message

[vpelipenko]

Could you try to clear cache? Or just remove var/cache folder. It can help you.

[antiseptikk]

@vpelipenko yes but it's not working

[maksek]

@antiseptikk, it must work. But you also can try do next

php -f [you magento2 root]/setup/index.php update

[vpelipenko]

@antiseptikk, please, take a look at our Developer Guide http://devdocs.magento.com/guides/v1.0/extension-dev-guide/create_module.html to make sure that you create module as described. I tried to do the same and it works for me.

[mzaroui]

I had the same problem and I fixed it using the command "php -f [you magento2 root]/setup/index.php update" thanks @maksek.
In case of a new module this command will insert a new line in "setup_module" table with the setup_version specified in module.xml file

[SyedMuneebb]

Maybe you have missed any step in creating custom module. Here's a step by step guide: Create Hello World module in Magento 2.