I keep get an "Error (-50)" message when I log into iTunes on my MAC

Question

I didn't have this as a problem before, but all of a sudden I cannot log into my iTunes account on my MAC.  When I try to go into Store and then Sign in, I get an "Error (-50)" message.  I have tried going in and changing the parental controls (something I saw elsewhere), but that didn't work.
I updated both my Mac OS and itunes, but that didn't change anything. I have restarted my computer and even done a hard reset by turning it off.  When I opened iTunes again, before I even did anything, it gave me and "Error (-49)" message. 
Also, I have some program called Safe-Eyes on my computer as a parental control, and went in and added all the different websites associated with iTunes (per another help page), but that hasn't worked either.
Because of this, I cannot get any of my songs from iTunes Match, except those that had already been downloaded onto the computer (1/16 of my music library).  Sure I can access them on my iPhone, but now I can't transfer that music onto my Nano.
One additional note: I saw on the communities the recommendation to delete your iTunes Download file, but I don't appear to have one in my iTunes Media folder. 
Thanks!

Answer 1

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
The title of the Console window should be All Messages. If it isn't, select
SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar at the top of the screen.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
☞ The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
☞ Some private information, such as your name, may appear in the log. Anonymize before posting.