Hi there danuwellnessphys,
Thanks for reaching out about entering transactions. QuickBooks Online is a great tool able to assist in keeping track of sales and expenses so you know the profitability of your company. I can provide some assistance with errors when entering transactions.
One possible cause for this error message would be browsing data, these temporary files can accumulate in your browser, system and network and cause errors like to one you're experiencing while entering transactions. You can resolve errors caused by browsing data using these steps:
If you have any other questions, feel free to reach out here.