Upgrading Drupal

Fatal error: Call to undefined function: module_exist() in /hsphere/local/home/oned1/onlinetips.org/includes/common.inc(1342) : eval()'d code on line 1

Is what I get when I do an upgrade from my 4.74 to 5.1.

Update.php runs fine, no error messages, but when I attempt to access any pages, I get that error.

Can someone please help me figure out what is going on? I'm not well versed enough in php to know what it means. I've looked at the line in the referred common.inc file and it looks like this:

print eval('?>'. $code);

I have read the forum posts regarding installing on 5.x, and have followed the various cures, but to no avail. I do get the toggle message to disable, but it is a nonfunctioning link. Is there any relief for this problem - I am already taking Tums - help please !

All the URL's for embedded images in pages etc have changed after an upgrade from 4.6 to 4.7. Both versions use the Drupal private method.

URL's in my content created under 4.6 point to eg <img src="/system/files?file=images/2005_01_29-001.jpg" where under 4.7 <img src="/system/files/images/2005_01_29-001.jpg" is what works.

Is this by deisgn (and I have to spend the next 2days editing pages to change the links), or do I have a problem somewhere?

Thanks for any guidance.

I have upgraded from 4.7.6 to 5.1 and have lost the help messages that appear at the top of the form. It looks as though the database format has changed and the upgrade script tossed my nice custom written messages. Any ideas on how to recover my old help messages?

I don't know what version of Drupal, nor do I know how to find out.

Hello!

I have a small and annoying problem, that has been bugging me for 2 days now.

I am upgrading a site from 4.7 to 5.1, together with CCK, Event and Marksmarty modules.
The database upgrade went smoothly, but a couple thingies appeared.