Call to undefined method Mage_Customer_Helper_Data::getIsRequireAdminUserToChangeUserPassword() in /home/vithauix/public_html/app/code/core/Mage/Adminhtml/Block/Customer/Edit/Tab/Account.php on line
Mage_Customer_Helper_Data::getIsRequireAdminUserToChangeUserPassword() was introduced in Magento 1.9, so it sounds like your
Mage_Customer_Helper_Data class is from an older version.
The most likely explanation is an override in
app/code/local/Mage/Customer/Helper/Data.php or replace it with
app/code/core/Mage/Customer/Helper/Data.php and re-apply your modifications.
Note that code pool overrides in
app/code/local/Mage are bad practice and avoidable in almost all cases. If you really need to change a method of this helper, use a custom module with a class rewrite instead. This way, you can extend the original class and only change selected methods, which is more update-safe.
Default Magento helper class
Mage_Customer_Helper_Data has a method
getIsRequireAdminUserToChangeUserPassword(). So I smell a core hack here or something happened with default helper class.
First check whether, you have a copy of this class in the local pool. ie at
app\code\local\Mage\Customer\Helper\Data.php.If such file does exist, then you should replace that file with default file which you can find it here. Beware this step, because this may completely remove all customization that you have performed to that file from the local codepool. So it is your job to include those customization too. For that you can compare your local codepool file with the default file (which I have provided in that link).
If no such file exist, you should replace the original
Data.php file with the file which I have mentioned. The core file location is at
Hope that helps.