I am new to drupal theme . I have created a direcory mytheme and added mytheme.info to it and copied other files from drupal's default theme directory . Now after editing the page.tpl.php, drupal is showing the errors below .
Notice: Undefined variable: hide_site_name in include() (line 99 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined variable: hide_site_name in include() (line 109 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: featured in include() (line 168 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: highlighted in include() (line 187 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: sidebar_second in include() (line 212 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: triptych_first in include() (line 220 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: triptych_middle in include() (line 220 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: triptych_last in include() (line 220 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: footer_firstcolumn in include() (line 230 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: footer_secondcolumn in include() (line 230 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: footer_thirdcolumn in include() (line 230 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
Notice: Undefined index: footer_fourthcolumn in include() (line 230 of C:\wamp\www\dtest\sites\all\themes\mytheme\bartik\templates\page.tpl.php).
After searching on google, I have found that clearing cache will solve the problem . But even after clearing my cache,it remains the same !
Generally these errors occurred when you call a region in your page.tpl.php file that doesn't exist in the theme's .info file.
In your page.tpl.php:
$page['footer_firstcolumn'];
In your theme's .info:
regions[footer_firstcolumn] = Footer first column
After rechecking all regions, don't forget to flush the cache.