So i’m trying to submit a form using ajax, in my form i have the following:

        $  form['actions']['#type'] = 'actions';         $  form['actions']['submit'] = array(         '#type' => 'submit',         '#value' => $  this->t('OK'),         '#button_type' => 'primary',         '#prefix' => '<div class="tc btn_pay relative">',         '#suffix' => '</div>                         </div>',         '#attributes' => array(             'class' => array('proximabold', 'tc', 'transition', 'no-underline', 'ph3', 'pv2', 'mb2', 'dib', 'white'),         ),         '#ajax' => [             'event' => 'click',             'callback' => '::updateTable',             'wrapper' => 'table-wrapper',             'progress' => [                 'type' => 'throbber',                 'message' => t('Verifying entry...'),             ],         ],     ); 

and a simple updateTable function:

public function updateTable(array $  form, FormStateInterface $  form_state) {     return "Hello World"; } 

But when i click on submit i get the error: An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (2 MB) that this server supports.

I knew that the error is server side, so i went to php.ini (i use PHP7) and update the following lines:

post_max_size = 6144M memory_limit = 6144M upload_max_filesize = 6144M max_file_uploads = 1000 

but without luck, this configuration shouldn’t be necessary as the request size is only 1.5KB