Find the register.phtml inside accessshop theme or any theme
Path: app\design\frontend\accessshop\default\template\persistent\customer\form\
then add this line below line
Path: app\design\frontend\accessshop\default\template\persistent\customer\form\
<input type="hidden" name="error_url" value="<?php echo $this->getErrorUrl() ?>" />
then add this line below line
<?php echo $this->getBlockHtml('formkey') ?>
& Same For Login Page if its also not working
EmoticonEmoticon