The state does not match. You may be a victim of CSRF.

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CSRF means Cross-Site Request Forgery and is a type of attack. Most likely it's a false positive. Aggressive caching may prevent JIG from adding users of external content sources. Try disabling W3 Total Cache plugin or other caching plugins just while you add your user. Once it is successful and saved, you can re-enable caching.

This troubleshooting fix was posted in External content sources on June 17, 2015