Why do I get errors with the RSForm! Pro Joomla! User Registration Plugin?

I am able to install the User Registration Plugin but unable to use or configure it. I'm using 1.3.0 r36 with Joomla! 1.5.23. I keep getting the following errors:

Configuration Page:

1)

Warning: array_unshift() [function.array-unshift]: The first argument should be an array in /home/vertigom/public_html/home/plugins/system/rsfpregistration.php on line 583

2)

Warning: Invalid argument supplied for foreach() in /home/vertigom/public_html/home/libraries/joomla/html/html/select.php on line 68

Manage Forms Page: "Table RSForm_Registration not supported. File not found."

I even tried the plug开发者_运维百科in with 1.4.0 but to no avail. Any solutions?

Some files were missing. I reinstalled & now it works.