How to create a module that shows some fields of profile2 type?
Your hook_theme() implementation is returning an array with missing details; the key should be variables and its value array should contain keys that matches the variable names in your template.

function profile_header_theme($existing, $type, $theme, $path) {
  return array(
    'profile_header' =&gt; array(
      'template' =&gt; 'profile_header',
      'path' =&gt; $path . '/theme',
      'variables' =&gt; array(
        'field_store_name' =&gt; NULL,   
      ),
    ),
  );
}