Notice: Undefined property: SocialThemes:

$model 	= $this->getModel( 'apistring' );

		$result = $model->getAPIstring( $userId );

 		$this->apistring = $result;

the code is located in view.html.php.

When i run

echo $this->apstring;

inside view.html.php i get no error, and the data is outputed.

But when i code in:

echo parent::display( 'canvas/default' );

in view.html.php

and

<? $this->apistring;?> or <? echo $this->apistring;?>

in /themes/default/canavas/default.php

I get the following error code.

Notice: Undefined property: SocialThemes::$apistring in /home/norcorp/public_html/media/com_easysocial/apps/user/textbook/themes/default/canvas/default.php on line 20

Looks to me like there are no data in $this-apistring.

What am i doing wrong?