Webmail screen goes blank after installing Plugin Manager

[viet]

When I enable Plugin Manager, the webmail screen goes blank. If I remove it from config, webmail page turns back to normal.
Here is config.inc.php's plugin value: $config['plugins'] = array('plugin_manager');

Roundcube version: 1.0.4
PHP version: 5.4.36
Webmail Installer page: http://pastebin.com/2fScRRtY
Error: http://pastebin.com/YAtpNZL8

Code Select Expand

Failed to load plugin file /home/vietvn/public_html/plugins/jqueryui/jqueryui.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /)
Failed to load plugin file /home/vietvn/public_html/plugins/libgpl/libgpl.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /)
[30-Dec-2014 00:26:13 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins//.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=settings&_action=plugin.password)
[30-Dec-2014 00:26:13 +0000]: PHP Error: No handler found for action plugin.password in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 462 (GET /?_task=settings&_action=plugin.password)
[30-Dec-2014 00:26:19 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins//.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /)
[30-Dec-2014 00:26:20 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins//.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=mail&_refresh=1&_mbox=INBOX&_action=list&_remote=1&_unlock=loading1419899182832&_=1419899182305)
[30-Dec-2014 00:26:20 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins//.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=mail&_action=getunread&_remote=1&_unlock=0&_=1419899182306)
[30-Dec-2014 00:26:22 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins//.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=settings)
[30-Dec-2014 00:26:44 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins/password,userinfo/password,userinfo.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=settings)
[30-Dec-2014 00:26:56 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins/password,userinfo/password,userinfo.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /)
[30-Dec-2014 00:26:57 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins/password,userinfo/password,userinfo.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=mail&_refresh=1&_mbox=INBOX&_action=list&_remote=1&_unlock=loading1419899219837&_=1419899219349)
[30-Dec-2014 00:26:57 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins/password,userinfo/password,userinfo.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=mail&_action=getunread&_remote=1&_unlock=0&_=1419899219350)
[30-Dec-2014 00:26:59 +0000]: PHP Error: Failed to load plugin file /home/vietvn/public_html/plugins/password,userinfo/password,userinfo.php in /home/vietvn/public_html/program/lib/Roundcube/rcube_plugin_api.php on line 227 (GET /?_task=settings)

Please help me find a solution for this. Thanks.

[SKaero]

You should ask the MyRoundcube team for support.