Kaltura_Client_Exception thrown

Invalid KS "OGQ1NTMzMjY0N2IwNWUzMGIyNjY0NzRhZjY4YmVmYjgxN2MxYzg1OXwxMDE7OzE0NzUyMzc1NjQ7MjsxNDc1MTUxMTY0LjY0MjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"