[SOLVED] Groupjive: Fatal error in Backend and Frontend

i get this message when I try to edit groups in Backend:

Fatal error: Call to undefined method cbgjClass::getPostParam() in C<span>:</span><span>\</span>xampp\htdocs\XXXXX\components\com_comprofiler\plugin\user\plug_cbgroupjive\plugins\cbgroupjivewall\cbgroupjivewall.php on line 621

i get this message when I try to edit groups in Frontend:

Fatal error: Call to undefined method cbgjClass::getPostParam() in C<span>:</span><span>\</span>xampp\htdocs\XXXXX\components\com_comprofiler\plugin\user\plug_cbgroupjive\component.cbgroupjive.php on line 1116

it also happens on the live site.

Joomla 1.7
GroupJive 2.4 RC2
CB 1.7

After re-install the plugin, everything works correctly.
Unfortunately, I do not know what went wrong before.