Cross-Site Request Forgery (CSRF) forces an end user to execute unwanted actions on a web application in which they're currently authenticated.
Unfortunately, a browser misconfiguration may set off these protections and cause this error, preventing you from interacting with your own data. In particular, browser extensions intended to improve privacy have been known to inadvertently break CSRF protection on websites.
A possible troubleshoot would be clearing your cache and disabling any new browser extensions.
Another possible cause is the blocking of cookies. Wild Apricot specifically places a cookie to prevent CSRF attacks.
