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Why cannot I get any value from configuration objects?

I have made a simple example to practice using the configuration API in Drupal 8. I created the twitter_pull.credentials.yml file in the config/install folder with the following content and flushed the cache.

oauth_access_token: "12345" oauth_access_token_secret: "67890" consumer_key: "54321" consumer_secret: "09876"

In a custom block, I use the following code to retrieve the configuration object.

namespace Drupaltwitter_pullPluginBlock; use DrupalblockBlockBase;  /**  * Provides a block for executing PHP code.  *  * @Block(  *   id = "twitter_pull_tweets_block",  *   admin_label = @Translation("Twitter Tweets")  * )  */ class TweetsBlock extends BlockBase {    /**    * Builds and returns the renderable array for this block plugin.    *    * @return array    *   A renderable array representing the content of the block.    *    * @see DrupalblockBlockViewBuilder    */   public function build() {     $config = Drupal::config('twitter_pull.credentials');     $enabled = Drupal::config('system.maintenance')->get('enabled');     dpm($enabled);     dpm($config);     drupal_set_message($enabled);     return 'this is a block: ' . $config->get('consumer_key');   } }

I don’t get any value from Drupal::config('system.maintenance')->get('enabled') nor $config->get('consumer_key').

What am I missing here?

This article was republished from its original source.
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Why cannot I get any value from configuration objects?

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