Did you run the upgrade.php script in the wp-admin folder?
Do you get this error when you access that script? If so did you download the zip version of the script? I had this happen to me also, different error, but all I did was download the tar version and that worked for me.
I did download the zip version
http://www.underburn.com (is where that main error resides)
what did you do with the TAR, did you just replace the files?
Tar is just another Zip format. I’m not sure if WinZip unzips Tar files, but I use WinRAR (you can find it on cnet here: http://www.download.com/WinRAR/3000-2250-10007677.html?part=dl-winrar&subj=dl&tag=button). Just treat the tar file like a zip file. Same process.
I did that, now I get something else (on the upgrade.php) The new error is…
Warning: Invalid argument supplied for foreach() in /home/underbur/public_html/wp-admin/upgrade-functions.php on line 30
Warning: Invalid argument supplied for foreach() in /home/underbur/public_html/wp-admin/upgrade-functions.php on line 88
Warning: Invalid argument supplied for foreach() in /home/underbur/public_html/wp-admin/upgrade-functions.php on line 96
Step 1
There’s actually only one step. So if you see this, you’re done. Have fun!
and look at http://www.underburn.com it says it isnt installed!
Fixed, my problem lied in the config file… I didnt alter the prefixes! Thanks Digital.