CLEVELAND — Elections officials in major Ohio counties say a surge in people voting by mail has been accompanied by a rise in ballot errors that cost time and money.

More than 6,000 voters in the county that includes Cleveland made mistakes with mail-in ballots for the May primary. Some left off necessary signatures or information, while nearly 100 even forgot to include their ballot in the envelope.

Cuyahoga (ky-uh-HOH’-guh) County elections workers try to fix errors so votes can be counted, and the process can be costly. Officials are already urging that mail-in ballot instructions be followed carefully for the November election.

County elections officials in Columbus say simpler rules would cut down on slip-ups. Any changes would be up to the Ohio Legislature.