Kaltura_Client_Exception thrown

Invalid KS "YTQ3YmFmZDM5NzZhMzU5MThkZDI1MThlOTg4NzFlMmJlOWRiNGM2NnwxMDE7OzE0NzQ4Njk1NTU7MjsxNDc0NzgzMTU1Ljc2ODk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"