When i click a sales invoice it says 404 Page not found!

I just encountered the exact same problem. The only causes I can think of were:

1. I deleted some invoice templates

2. I am accessing my account from another computer for the first time

Help!

Hi ben-susanto,

This happens when your browser is full of frequently-accessed activities that cause you to get this error. You can use a private browsing window and press the corresponding keyboard shortcut:

• Chrome: Ctrl + Shift + N
• Internet Explorer: Ctrl + Shift + P
• Firefox: Ctrl + Shift + P
• Safari: Command + Shift + N

Once done, if it works, go back to your previous browser and clear your browser cache so the system can start fresh.

Otherwise, you can try switching to a different browser. 

I have included this article in case you have other questions about QuickBooks Online: Manage Customers And Income.

Please let me know if you have other questions. I'll make sure to help.