Errors Messages When Trying to Save/Export Bills

So when I got to print the bill before exporting it I get this message:

"Remember that you MUST approve the bills once they are correct. Otherwise your history, transactions and accounts receivable will not include these bills."

Then it prints and I try to export it and I get this message:
"There were no clients that matches the criteria to export."

This is after I've changed the dates, etc. for the Client Info. HELP!! I need this resolved ASAP!!