Kaltura_Client_Exception thrown

Invalid KS "ZDQ5YWM2OWUwNWVlMWY5YjEyNjBhNWJiMjg1NWQ4MDM2ZWRjNjA5NnwxMDE7OzE0NzUzNzg1MzY7MjsxNDc1MjkyMTM2Ljk0OTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"