I had a page.tpl.php with a few regions and blocks inside of it. every thing was right, I decided to rearrange regions and block so I deleted the old regions and blocks. but I cannot add new regions anymore!!! Drupal errors that you cannot place any block in this region and besides that when I click on demonstration of regions button in structure->block->Demonstrate block regions, it doesnot display this region
this is info file:
name = Pars Institution Theme description = This theme is designed for Pars Institution core = 7.x ;Regions regions[hidden_block]=Hide regions['leftside']=Leftside ;CSS stylesheets[all] = css/style.css stylesheets[all] = css/login_block.css
this is php code
<div id="leftside_column" style="float:left;width:280px;height: 100%;"> <?php print render($page['leftside']); ?> </div>
I also cleared the cache. what is the problem?