Dear Dev CMSmadsimple Team

hope you all concern same my error
I have create few text content block in template layout, First I create it 2
text
and i use it for
{content block="pag_desc" bock_type="text" block_group="SEO" label="Page
Description" wysiwyg="false" oneline=true size="100%" assign="pag_desc"}
{content block="keywords" bock_type="text" block_group="SEO" label="Keywords"
wysiwyg="false" oneline=true size="100%" assign="keywords"}
<meta name="description" content="{$pag_desc}">
<meta name="keywords" content="{$keywords}">

Above it working well,
 But when I create other one bellow and using it some place than I got error
{content block="pag_bg" bock_type="text" block_group="SEO" label="Page
Description" wysiwyg="false" oneline=true size="100%" assign="pag_bg"}

1-- Notice: Undefined index: pag_bg in
path\lib\smarty\libs\sysplugins\smarty_internal_templatebase.php(151) : eval()'d
code on line 77
2-- Notice: Trying to get property of non-object in
path\lib\smarty\libs\sysplugins\smarty_internal_templatebase.php(151) : eval()'d
code on line 77

Please any want concern, thanks in advance,
Chhoun Ty