Kaltura_Client_Exception thrown

Invalid KS "ZmEwZjEzNWJlMDNhN2MxNDY1MzQ4NDA2ZDIxYTQwZDgyMjQ3NWM1NHwxMDE7OzE0ODEzMzUwMzM7MjsxNDgxMjQ4NjMzLjQ0NDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"