Kaltura_Client_Exception thrown

Invalid KS "MjFhYjgzZmU5Nzc2YmQ0MjY5OTczYTE1NWI4MjI5ZWE3MGQxOTA5M3wxMDE7OzE0NzQ4NTcxMjk7MjsxNDc0NzcwNzI5Ljk5Nzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"