room settings error

Following the instructions for installation of the BigBlueButton plugin item 13 states:
”
13 Fill out the URL of where the BigBlueButton server is running (be sure to add /bigbluebutton/ to the end of the URL) and its salt. Then click on Save.
”
replacing http://test-install.blindsidenetworks.com/bigbluebutton/ by http://mysite.mycountry/bigbluebutton/

I get the following error message:

Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : Space required after the Public Identifier in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): ^ in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : SystemLiteral ” or ‘ expected in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): ^ in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : SYSTEM or PUBLIC, the URI is missing in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379 Warning: SimpleXMLElement::__construct(): ^ in /customers/0/4/c/mysite.mycountry/httpd.www/wp-content/plugins/bigbluebutton/includes/class-bigbluebutton-api.php on line 379

of course “mysite.mycountry” are a replacement of the real sitename.

Anyone any idea what is wrong and how to solve this ?

Greetings,

René.