Kaltura_Client_Exception thrown

Invalid KS "ZWM0YTFlYjFlOGRkODE2MjAyNGQwMmQ3NWM5ZmRjZTQ2MGYzYmI3MXwxMDE7OzE0OTMwNTc0NjY7MjsxNDkyOTcxMDY2LjA0MTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"