Fatal error: Class 'Browser' not found : After Updating drupal 6.20 to 6.26 As i am update my durpal version 6.20 to 6.26 and it gives these error after updating.

   1) Fatal error: Class 'Browser' not found in /opt/lampp/htdocs/mydrupal/includes/common.inc(1731) : eval()'d code on line 4

   2) warning: include(Browser.php) [function.include]: failed to open stream: No such file or directory in /opt/lampp/htdocs//opt/lampp/htdocs/uls/includes/mydrupal/includes/common.inc(1731) : eval()'d code on line 3.


I checked the common.inc file and there is no code for "including browser.php"
The error message says eval()'d code on line 4. You have a PHP block, node or something similar that tries to include a file called Browser.php. That is not a file supplied with Drupal core. What you can do... just before line 1731 add something like if(strpos($code, 'Browser.php')) { file_put_contents('/tmp/log', print_r(debug_backtrace(), TRUE)); exit;} and then study the log to see where it's called from to figure it out. If it's called from block, the backtrace will contain the module and delta, if it's a node, the nid will be there and so on.