[Typo3] System Error: No typeVal was sent!

[Louis Bouchard]

Hello everyone,

When I want create "PageContent", I got this error in the HTML Editor : 
System Error: No typeVal was sent!

I check the PHP file (rte.php) that trap this error and it's about those lines :

   // Record "types" field value:
  $this->typeVal = t3lib_div::_GP('typeVal');
  if (!isset($HTTP_GET_VARS['typeVal'])) {
   die ('System Error: No typeVal was sent!');
  }

I use package dummy-3.7.0.

Any idea about what it's can be?

Thanks very much