Profitability Report by Customer - all customers in date range

Glad to see you here in the Community, @Scott4j. I’ll be glad to assist you in sorting this issue about the error message when running the Profit and Loss report. 

The first thing I can suggest is to look at a possible browser issues. Stored cache can caused unexpected issues so let's try to do some basic browser troubleshooting actions first.

Here’s how:    

    1. Restart your browser.
    2. Open your browser's private window.
    3. Clear your browser’s cache.

If issue persists, I suggest contacting our QuickBooks Online Support for assistance. They can investigate this issue further for you.

Moreover, keep this link for future reference to guide you further in memorizing reports in QuickBooks Online.

If you have any trouble with any transactions in QuickBooks, please let me know and I’ll do everything I can to help here in the Community!

Thank you for the suggestion but after doing that it still gives the same error.

Thanks for the update, @Scott4j.

I do appreciate you for doing the steps my colleagues provided.

Since the recommended troubleshooting laid out above didn't work. I suggest you contact our support team. This way, they can further investigate what causes the issue and generate steps to fix it for you.

To reach them, here's how:

1. Click the Help icon on the top right.
2. Click Contact Us button at the bottom.
3. Enter a short description about your concern.
4. Click on Let's talk.
5. Choose the method on how you'd be connected to support.

I encourage checking our support hours first to ensure that we address your concerns on time. 

You can check this article to help you out in customizing reports in QuickBooks Online.

For more hints and resources as your get started with QBO. Here's the link: QuickBooks help articles, video tutorials, and more.

Stay in touch with me if you any other questions by adding a comment below. I'm always here for you. Have a great day!