You have managed to REPLY here, so that is half the battle.
Try your New Question again - if it is LONG, create it in an external editor like TextEdit and copy/paste it into the question BODY to avoid being logged out due to the login TimeOutLength of ±30 minutes.
If it still fails, quit the browser & restart your Mac or iDevice then try again. Take FULL Display screenshot of the screen just BEFORE you experience the issue AND of the resulting Error - 2 screenshots - then post them here
===
⌘ Command + ⇧ Shift > Press ' 3 ' > release all three
to capture a "Dialog box or Alert Message", ⌘ Command + ⇧ Shift > Press ' 4 ' > SPACEBAR , the cross-hair cursor will turn into a "Camera" and hilite the dialog > click the mouse button.
The image will be saved to your Desktop as '.png' file and be named differently according to your OS X version.
Press and hold the Sleep/Wake button on the top or side of your iPhone, iPad, or iPod touch, then immediately press and release the Home button. You can find the screenshot in your Photos app.