Kaltura_Client_Exception thrown

Invalid KS "OTcwMWJjODJkY2E0ODZjYzRkY2M2MmI1ODQ4OWZlNjliMzU3YWM1MnwxMDE7OzE1MDA4NTA3NzQ7MjsxNTAwNzY0Mzc0Ljc0MDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"