As far as I understand, they are discouraging using cover letters due to the volume of applications
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It's a constant uphill battle that you just have to have patience and perseverance to get past. Don't close the windows when it errors, but instead hit refresh about every minute or two and it will slowly get you through. I've been at it since just before it posted and I'm still not all the way through it. Don't give up!
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I've been dealing with the same issues. I've been exclusively using Google and refreshing every 60 seconds on the errored page.
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