Kaltura_Client_Exception thrown

Invalid KS "Y2QxZWZkYWQyYTQ1Y2VlZWJiOTkzZDM3MjAxZDNhM2QzZmU2MDQ1MnwxMDE7OzE0NzUwMTA4NzQ7MjsxNDc0OTI0NDc0LjY5NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"