I've been experiencing the same errors and it's not as detailed as that post makes it looks. I've had all of those errors PLUS dozens more and had to wwork through them by myself. From what it looks like, your temp folder doesn't have the right permissions set. FTP to your site and CHMOD the temp folder to 777, which is basically giving Read, Write, and Execute capabilities to User, Group, and Other. That should fix the issue you're having now. I could be wrong, but I'm positive that's it.