Fatal error in built-in view due to view.php

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My site is using 5.6, newly upgraded yesternight and acromin5 theme.

I've been adding content in all day without a problem and for some reason when i went to check on it late last night, it will log me into built-in view but won't let me change anything.

There are two lines of text running across my content:

Warning: include() [function.include]: Filename cannot be empty in /home/USERID/public_html/concrete/core/libraries/view.php on line 590

Warning: include() [function.include]: Failed opening '' for inclusion (include_path='/www/MYSITE.com/libraries/3rdparty:/home/USERID/public_html/concrete/libraries/3rdparty:.:/usr/lib/php:/usr/local/lib/php') in /home/USERID/public_html/concrete/core/libraries/view.php on line 590

I've substituted out my site and my userid name, which you can see is capitalized, but otherwise that's the exact same message i am getting.

I have also went to view.php and below are surround text of line 590:
/**
       * render's a fata error using the built-in view. This is currently only
       * used when the database connection fails
       * @access public
       * @param string $title
       * @param string $error
       * @return void
      */   
      public function renderError($title, $error, $errorObj = null) {
         $innerContent = $error;
         $titleContent = $title; 
         if (!isset($this) || (!$this)) {
            $v = new View();
            $v->setThemeForView(DIRNAME_THEMES_CORE, FILENAME_THEMES_ERROR . '.php', true);
            include($v->getTheme());


I am not a techie, but i have been using concrete5 for about half a year now, first time running into this problem. Is it because something I did? Please let me know how to fix this.

Your help would be greatly appreciated. THANKS!