Kaltura_Client_Exception thrown

Invalid KS "OWY3NzkxZmI5ZTI0MmM0MmRjN2ZjY2ZiNjE0NDE4NzliNWJmNzM5ZnwxMDE7OzE0OTM1ODg1OTM7MjsxNDkzNTAyMTkzLjc3Mzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"