Kaltura_Client_Exception thrown

Invalid KS "MGVmZDgwMjEyODRkZDJmMWIzZGZmOTM1NTQ0MTJlYWFlZThkNjZjMXwxMDE7OzE0NzUxNTE5Nzk7MjsxNDc1MDY1NTc5LjczNDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"