Millisecond Forums

Hi there, 
one  of my subjects, who says that she is using windows 10 (no anti-virus software) and mozilla, installed the Inquisit Web Player, but is prompted with the error message "invalid command line" when she clicks on the "Start button". Do you have an idea why this error occurs? The link to the study is: http://research.millisecond.com/linkej/SFB636C6Online.web.
Best
Julia