Help, getting "500-Internal server error"

I was working on this site last night and pulled it up again today. Now I'm getting an Internal Server Error. Here is the message.

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Here is what the Error Log says "Premature end of script headers: /home/never18/public_html/admin/index.php"

What do I need to fix?

Corinne

I just checked it again and now it is working....Go figure....

Corinne

did you make modifications to or install modules which affect the /admin/index.php file recently?

No, I had not. I'm not sure what had happened. I checked it again this evening and the site seems to be running fine.

Thanks,

Corinne