So you just reset your password, but you keep getting this message or something similar a bunch of times?
Fear Not .... This is a very common issue with a very easy resolution.
First a brief explanation of what the keychain is so you understand why this occurs.
What is the Keychain?
Keychain is password management system in OS X developed by Apple. It was introduced with Mac OS 8.6, and has been included in all subsequent versions of Mac OS, including OS X. A Keychain can contain various types of data: passwords (for Websites, FTP servers, SSH accounts, network shares, wireless networks, groupware applications, encrypted disk images), private keys, certificates, and secure notes. You will find Keychain in the Utility folder in the Applications folder. Unless you indicate otherwise on a case-by-case basis, you can not open your keychain without your administrator password.
Keychain will generate and store all your Safari-based passwords and autofill them for you where and as needed. However, there may be times when a website doesn't allow autofill (for example, at public terminals or when a site has been coded to specifically block autofill).
When you change your district password your saved passwords in the keychain also change causing the keychain to, in essence, freak out.
How do I make it go away?
TSS has created a very simple process to resolve this issue quickly.
Please Note: To avoid this issue in the future, please follow change your password using the instructions provided HERE.
INSTRUCTIONS:
Step 1: Open Self Service Application on your Computer
Open Self Service by clicking on this icon locating on your dock, or in the launchpad 
Step 2: Log in using your District Credentials
Enter your district credentials in the box (shown below) to log in.
Step 3. Locate the Fix my Keychain Icon
Under Featured find Fix My Keychain and Click Install:
Click Install Again on the box that pops up:
Step 4: Your computer will reboot
Upon Reboot the keychain issue will be resolved.
You will just need to renter your new password for both Google Drive and your Email accounts.
If you are still having Issues Logging into the PTHSD-Guest Network, please contact the TSS Help Desk by dialing 4444 from any district phone, or by opening a Help Desk Ticket using the Instructions here.