Template Errors: message.css

  1. A non-numeric value encountered in /home1/forumsmu/public_html/library/XenForo/Template/Abstract.php(265) : eval()'d code, line 30: 
    29: 		
30: 		margin-right: -' . (XenForo_Template_Helper_Core::styleProperty('content.padding-right') + 5) . 'px;
31: 	}

An exception occurred: Cannot modify header information - headers already sent by (output started at /home1/forumsmu/public_html/library/XenForo/Template/Abstract.php:215) in /home1/forumsmu/public_html/library/XenForo/CssOutput.php on line 565

  1. XenForo_Application::handlePhpError()
  2. header() in XenForo/CssOutput.php at line 565
  3. XenForo_CssOutput->displayCss() in XenForo/CssOutput.php at line 599
  4. XenForo_CssOutput::run() in /home1/forumsmu/public_html/css.php at line 12