Kaltura_Client_Exception thrown

Invalid KS "MGEyNDMwNGIyZWI0NjNiMDllNTcwNTQ0NjJjNTE3ZTM1OTE2NGIzZnwxMDE7OzE0NzUzNTU2OTk7MjsxNDc1MjY5Mjk5LjE4MzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"