errormacosterminal
Terminal works just fine in my admin account, but won't open a terminal window in any of my regular user accounts. If I choose Shell > New Window > New Window with Settings, I get the following "Internal error":
Exception Name: NSInvalidArgumentException
Description: -[TTView touchBar]: unrecognized selector sent to instance 0x7fde735b0710
User Info: (null)
macOS 10.12 Sierra
There may be better answers coming but if not.
I would either Partition the Hard drive and create a second bootable partition then use the older Xcode there.
Or Install it on a different Machine.
I support some apps on 10.6 and ran into similar problems and now use the older Xcode on another Machine. But have used Partitioning in the past for even older Xcodes.
In fact the Mac I am now has two Partitions for 10.10.x where one is for the Beta Version of Xcode.
Debugging mail has become a bit cumbersome since the program is now designed to do all of the network requests on background threads and the main UI never blocks. Worse, I don't think there's any way to see important statistics like: What percentage of network requests time out or error? What is the response time for my mail server over time.
With that being said, here are the things I do to isolate and debug mail.
You will now have more data than you might like, but watch for the green light status of the Internet Connection and the status / errors of IMAP/SMTP and other items in the doctor window.
If I don't have a problem and all the lights are green, I quit make and use Finder to navigate up one folder from the logs and compress the entire Mail folder. That gives me a baseline of when things worked.
At that point, if there is an error, you can dig into the logs or post here. You could engage AppleCare or your mail provider for help - and now you have logs. Asking a follow on question with some error message from the logs might also be worth while here. (Or even ask what the various logs mean).
If there isn't an error on the new account, log out of the test Account on your Mac and log back in to your main account and repeat the connection doctor steps. Enable logs there if you find a problem.
TL; DR - your mail issues are the same as my Mail issues and I'm not using exchange, but I do use an IMAP mail server in France which is across the atlantic from where I typically work. My suspicion is that the network errors and time outs are happening and I don't get good feedback when these errors happen and instead Mail hides all the evidence, diligently re-trying a slow connection and in the end making me unhappy. I'm looking to see if I can gather mail statistics so that I can monitor health of my mail connections in aggregate and then choose a faster mail server based on evidence, but so far, I'm only able to find out when the servers are down as opposed to being too slow to effectively work, but up enough to answer Mail's patient requests within 2 minutes so I don't actually get a "failure to connect".
Best Answer
Go to System Preferences —> Parental Controls —> (select your Standard User Account) —> Allowed Apps In the below list see whether terminal is allowed or not. if not just enable it.