Invalid Form Validation errors
Using Jamroom
So in Jamroom every form has what's called a "form session" - this is basically information about the form that the core uses to do things like validation, CSRF protection, etc. When you get this error it means that Jamroom was not able to find the form session that was being requested. This really shouldn't happen and would indicate something messed up in the user session. Logging out and back in again should fix it up, but again - you should rarely see this.
If you find you are consistently getting this error than it likely indicates there's something else going on and we need to check it out, so open a support ticket and we can investigate.
Thanks!