Unfortunately, Mail has stopped

I have an HTC One M8 and am using the stock launcher and am not rooted. I keep getting the error *Unfortunately, Mail has stopped.* when I try opening the stock HTC mail app. I have gone into the App Info for the mail app and tried to "Clear cache" but it doesn't look like it's doing anything. I have also gone to **Settings>Accounts & Sync>Exchange ActiveSync** and unchecked Mail in the account that is using it. I have also tried rebooting my phone. Any other tips or advice aside from basically wiping the phone? Thanks