Notice: Undefined index: alias in path_form_element_validate() (line 156 in /var/www/eplus.cn/modules/path/path.module).

It does not work at all when i test it in a Linux machine.

When i add a breadcrumb, i get a fatla error:

"
Notice: Undefined index: alias in path_form_element_validate() (line 156 in /var/www/eplus.cn/modules/path/path.module).
Recoverable fatal error: Argument 2 passed to drupal_array_set_nested_value() must be an array, null given, called in /var/www/eplus.cn/includes/form.inc on line 2518 and defined in drupal_array_set_nested_value() (line 6510 in /var/www/eplus.cn/includes/common.inc).
"

It works at my local machine when I use XAMPP.