[TYPO3-english] Fatal error: Call to a member function modAccess() on a non-object

[J. Bakshi ( জয়দীপ বকসী )]

Hello list,

This is typo3 4.6.4 installation. Whenever I try to open the configuration
of any extension; like phpmyadmin , rtehtmlarea  etc... from extension manager;
I get an error as

` ` ` `
Fatal error: Call to a member function modAccess() on a non-object in ../typo3_src-4.6.4/typo3/sysext/em/classes/index.php on line 48

Call Stack

#	Time	Memory	Function	Location
1	0.0002	674336	{main}( )	../ajax.php:0
2	0.2307	19110552	t3lib_div::callUserFunction( )	../ajax.php:73
3	0.2313	19179952	call_user_func_array ( )	../class.t3lib_div.php:4746
4	0.2313	19180096	t3lib_extjs_ExtDirectRouter->route( )	../class.t3lib_div.php:4746
5	0.2325	19326400	t3lib_extjs_ExtDirectRouter->processRpc( )	../class.t3lib_extjs_extdirectrouter.php:106
6	0.2627	22123232	call_user_func_array ( )	../class.t3lib_extjs_extdirectrouter.php:183
7	0.2627	22123288	tx_em_Connection_ExtDirectServer->getExtensionConfiguration( )	../class.t3lib_extjs_extdirectrouter.php:183
8	0.4033	30237240	tx_em_Install->updatesForm( )	../class.tx_em_connection_extdirectserver.php:278
9	0.4914	30658080	tx_em_Install->tsStyleConfigForm( )	../class.tx_em_install.php:1524
10	0.5467	30942016	t3lib_div::callUserFunction( )	../class.tx_em_install.php:1369
11	0.5468	30945240	call_user_func_array ( )	../class.t3lib_div.php:4746
12	0.5468	30945400	tx_tdthemeinstaller->install( )	../class.t3lib_div.php:4746
13	0.5468	30945400	tx_tdthemeinstaller->getExtkey( )	../class.tx_tdthemeinstaller.php:47
14	0.5468	30945552	t3lib_div::makeInstance( )	../class.tx_tdthemeinstaller.php:127
15	0.5468	30945552	t3lib_div::getClassName( )	../class.t3lib_div.php:4910
16	0.5468	30945632	class_exists ( )	../class.t3lib_div.php:4953
17	0.5468	30946136	t3lib_autoloader::autoload( )	../class.t3lib_div.php:0
18	0.5468	30946136	t3lib_div::requireFile( )	../class.t3lib_autoloader.php:97
19	0.5539	32432152	require( '/var/www/booena/typo3_src-4.6.4/typo3/sysext/em/classes/index.php' )	../class.t3lib_div.php:5148

` ` ` `

Could any one give any clue please ?

Thanks