Kaltura_Client_Exception thrown

Invalid KS "ZWRiOGZmN2M2MTZjOGFlMmQyOTA3MjBhNTQ3YTUzOWExNWQ2MmU1MHwxMDE7OzE0NzUyNDk2NTg7MjsxNDc1MTYzMjU4Ljc5NDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"