Kaltura_Client_Exception thrown

Invalid KS "ZTk3Mzc3NTE5MmVkZWFhYTI3ZjQ5YjAyODEyNTUyMzY5ZjEzOWNlNHwxMDE7OzE0Njk1ODE0MzE7MjsxNDY5NDk1MDMxLjQ1NTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"