Kaltura_Client_Exception thrown

Invalid KS "OWQ4YmU0NTYzOGUzYjE5ZDNiYTgxZDVjN2U3MmM0M2I5YjRmYTU3NnwxMDE7OzE0NzUyNjM1MjQ7MjsxNDc1MTc3MTI0Ljk4MTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"