I don't think so, have you rebooted after installing the plugin?
If not, please try to shut down the server completely, pull the power cord from the wall, press the on/off and rest button on your server a few times (to empty the caps) wait for 30 seconds, put the power cord back into the socket and turn on the server.
After you booted please attach the Diagnostics (Tools -> Diagnostics -> Download) and drop the downloaded zip file here in the text box if it doesn't work after the reboot.