Two Simple Steps to Fix Quicken Error 324

STEP ONE: Deactivate Bank Account

Go to the Accounts menu and choose Hide and Show Accounts.
In the List column, find the account(s) causing the error and uncheck any accounts with this bank (be sure to uncheck all accounts with the bank, even if they’re not showing an error).
In the Account View, highlight each account (one at a time) and click the Settings button on the bottom right of the screen
Under the At Your Financial Institution section, click on Troubleshooting, then click on Deactivate Downloads.
Repeat steps 3 and 4 to deactivate each account for the affected bank.

STEP TWO: Reactivate Bank Account

Click on Set up transaction download in Settings.
At the bottom of the window that lists the banks, click the My bank is not listed question mark to update the bank list; when the list finishes updating, it should display the current date. Click the Show List button to continue.
Type the name of your bank and select it from the list, then enter your login credentials and click Continue.
Quicken will display a list of all accounts you have with this bank. Carefully link each of these accounts to the appropriate account you’ve set up in Quicken.