This usually happens when there is an error in the sightly script, or the included files present in that script.
Now, if this was component specific, you would get the page, but the component would not be visible. But, as the whole page is not visible, I suspect something wrong in the template's html file on which this page is created.
You can check error logs , I'm pretty sure, you would get to the .html file of the template whose structure component is having this error.