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Cause(UNKNOWN_EXCEPTION): UNKNOWN_EXCEPTION: An unexpected error occurred. Please include this ErrorId if you contact support: 2001598904-4836 (639128743)

I am reasonably certain this is a SF issue but thought I would post on the outside chance that anyone had a tip.
NagendraNagendra (Salesforce Developers) 

This means that an unhandled exception occurred in the underlying application server that Salesforce runs on. There's no way to tell what is the cause without raising a case with Salesforce support, as they need to look at the logs in conjunction with their code (i.e. the code that Salesforce is written in) to figure out what caused the exception.