I need some help.

After installing vBa, nothing is showing up except the stock vBulletin board. When I went to "Edit Modules," and looked at some of the modules ("Site Navigation," "Online Users," etc.), it contains the following lines:

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Warning: opendir(./modules): failed to open dir: No such file or directory in /admincp/vba_cmps_admin.php on line 630

Warning: readdir(): supplied argument is not a valid Directory resource in /admincp/vba_cmps_admin.php on line 631

Warning: closedir(): supplied argument is not a valid Directory resource in /admincp/vba_cmps_admin.php on line 639
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Can someone tell me how I can fix this problem? Your help is greatly appreciated.