Kaltura_Client_Exception thrown

Invalid KS "M2ViMmUzYjk3MDU5NzlmYjZiNjgwOWMzNjQzNzRjOTY1NmFhN2FhNHwxMDE7OzE0OTYxNzI3NTM7MjsxNDk2MDg2MzUzLjA1NDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"