still not able to automatically log in to webcalendar

Follow the instruction here, I tried the webcal integration, it didn't work for me.

here it is the output from the print

uid=0
login=
Array
(
[access webcal] => Array
(
)

[login to webcal] => Array
(
)

)

Warning: assert() [function.assert]: Assertion "! empty ( $user )" failed in D:\Program Files\xampp\htdocs\drupal510\webcalendar\includes\access.php on line 335

I have two more question

1. is the webcal module handle the user registration for webcalendar upon the drupal user registration or not?

2. if it didn't, should I register the webcalendar user seperately, but choose the same user name / pwd, is this correct?

Please share me with your experience here. Thanks.