Why am I getting an error message when I try to create new invoices?

I'm here to help you create an invoice successfully in QuickBooks Online (QBO), hanley.

Beforehand, may I know the error message you've encountered? Adding additional details will help us provide accurate steps to fix this. 

In the meantime, I recommend logging out and logging back into QBO. Doing so refreshes your account for the updates to take effect. 

If this isn't the case, I suggest accessing your account using a private window. This way, we can determine whether this is a browser cache-related issue. The browser utilizes cached data to load web pages quickly. However, excessive cache can lead to problems that impact the appearance and functionality of your account.

An incognito mode helps us verify the issue since this doesn't save any files. Here are the keyboard shortcuts: 

• Safari: Command + Shift + N 
• Google Chrome: CTRL + Shift + N
• Mozilla Firefox or Microsoft Edge: CTRL + Shift + N

If the balances show, clear the browser's cache. Doing so deletes all the data from your browser and optimizes its performance. Using other supported browsers also helps us verify if this is a browser-specific issue. 

I'll be around if you need more help managing your sales transactions with your QBO. Keep me in the loop by tagging me in your reply. Keep safe!