Kaltura_Client_Exception thrown

Invalid KS "Nzc1ODIxNzNiNTg4Mzg5YWNjMzQ4Njc3Njg1OWYwNWJjMTQ5OWVhOHwxMDE7OzE0NzUyMzI2NzM7MjsxNDc1MTQ2MjczLjU1Njc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"