"Unexpected Platform Error"

So I just finished downloading 5.18 without any problems on the patcher. Howerver, now when I attempt to log-on I'm getting the above error message. "Unexpected Platform Error" Does anyone know what the issue is here? TY in advance for any help.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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