Iam using joomlacomment4.0.0RC1 and i want to use compojoomcomment4.1.8
i have this error in installation ( on my three different webhostings !)
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /libraries/joomla/installer/helper.php on line 142 Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /libraries/joomla/installer/helper.php on line 142 Warning: Invalid argument supplied for foreach() in /libraries/joomla/installer/helper.php on line 187

so i try manuall install...everything is ok, settings com_content, plugin is on but on page i dont see comments.
i tryied all ! install from package, manual install, taking compocomments from my only one web page where it is good, taking ftp files and sql, i really try all ! under content is nothing...i cant see errors or what, iam getting mad..please help