“options.php” not found

Like @LupuAndrei said, we lack of details, especially the code where you call you form from.

But I suspect, again like @LupuAndrei said, you might not be calling the settings_fields, do_settings_fields or do_settings_sections correctly.

On the function where you build your form, try something like this

<form method="post" action="options.php">
   <table class="form-table">
      <?php 

      settings_fields( 'animated-settings-group' ); // This will output the nonce, action, and option_page fields for a settings page.
      do_settings_sections( 'hoogleyboogley_animated' ); // This prints out the actual sections containing the settings fields for the page in parameter 

      ?>
    </table>

  <?php submit_button(); ?>
</form>