Drupal 7.x

I have just transferred a Drupal 7 site from my local development environment (OSX / MAMP) to a CentOS server.

It seems to work for the most part as an anonymous user, it's a fairly simple site at this point, however I can instigate the following error in 2 ways:

PHP Fatal error: Class 'DOMDocument' not found in modules/filter/filter.module on line 1041

Either by:

Hi, so I am working on my site and almost done with it.

Now I just need to make it so that users can register accounts that will need to be approved.

Basically I need to fill out a few fields I have already set up, like:

Name
Address
Phone
City
etc...

But I don't want them to have to fill out a username, as the username is a value that will be determined by the admin that approved the registration. What is the best way to do this?

So I'm a new and growing web designer/developer with most experience in HTML and CSS (a little PHP, but mainly just for specified tools). I was recently hit with a small eCommerce job and my client wants a small store for her new T-shirts and Jewelry. Originally I was going to make it from scratch as per usual, but I'd just begun studying Drupal about a week before hand and figured "Hey this seems more feasable. I however just found that drupalecommerce.org (i think it is) is down.

For some reason, when I want to edit posts of any content type the body field doesn't show and I am not able to edit the content. Is this a bug in drupal 7?

I am creating an FTP replacement and was hopping I could show the user info about the attached file.

I am assuming I should use the File Field to attach the file but I am not sure how I would allow the user to download the file and give info about the file. Name, Size, Upload date, and times downloaded. Any feedback would be great. I am just starting so I have not installed any extra modules.

Thanks!

Brand new to Drupal. Created a test site using 7.7, running on OS X Lion Server.

I have Media Gallery installed and enabled, but when I create a test gallery and upload some images, just the broken link icon is displayed (both in the thumbnail and on the image page itself). I can download them again using the Gallery link, and checking in Finder shows the images are being uploaded.