Hello there, Olive.
I noticed a similar question on the error you've encountered when trying to load your expenses in QuickBooks Online (QBO). Fortunately, another member of the Community has already posted a helpful response addressing your concern.
Here's the link to their response, which outlines the recommended steps you can follow: https://quickbooks.intuit.com/learn-support/en-uk/transactions/re-quickbooks-won-t-load-my-expenses-...
I'll also share this article in case you'd like to generate a monthly expense report to help you track how much you pay your suppliers each month: Run a monthly expense report by supplier.
Feel free to reply to this post if you need further assistance.