i am working on theme in magento 2,but i am getting error in terminal(CMD),the error message is "unable to load theme by specified key:My/Helloworld" when i run php bin\magento setup:static-content:deploy, my required file are app\design\frontend\My\Helloworld\composer.json

    "name": "magento/theme-frontend-My",
    "description": "N/A",
    "require": {
        "php": "~5.5.0|~5.6.0|~7.0.0",
        "magento/theme-frontend-blank": "100.0.*",
        "magento/framework": "100.0.*"
    "type": "magento2-theme",
    "version": "100.0.1",
    "license": [
    "autoload": {
        "files": [



3 Answers 3


A common oversight which could throw this error is forgetting to run:

bin/magento setup:upgrade

This allows Magento to register your theme in the 'theme' table of the Magento database. You can check if your theme is registered via the mysql command line:

mysql> use <your magento database>;
mysql> SELECT * FROM theme;

If your theme is registered also make sure that the 'type' column value for your theme record is 0. Values of 1 can also lead to this error.


have you declare theme name from di.xml like below. Below code is the example for creating backend.

<type name="Magento\Theme\Model\View\Design">
        <argument name="themes" xsi:type="array">
            <item name="frontend" xsi:type="string">Magento/luma</item>
            <item name="adminhtml" xsi:type="string">Learning/backend</item>

and run the below commands in CLI

  1. php bin/magento cache:clean
  2. php bin/magento setup:upgrade
  3. php bin/magento setup:static-content:deploy

if still not working go to admin panel clear the cache and clear the flush and re run above commands it will work.

  • Let me get this clear: do I need to add this to the di.xml of my module? Still doesn't work for me ... Mar 24, 2016 at 13:06
  • @GielBerkers, Yes ad the di.xml file. Apr 1, 2016 at 11:13

I have the same issue, this may be due to cache files

Remove following directories pub/static, var/cache, var/composer_home, var/generation, var/page_cache,var/view_preprocessed

Then run the following command line from terminal/shell: php bin/magento setup:static-content:deploy

  • After following your instructions I got: There are no commands defined in the "setup:static-content" namespace
    – m.spyratos
    Jun 22, 2017 at 21:34

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