Kaltura_Client_Exception thrown

Invalid KS "ZTQxYmQ2Y2Q1YzljMzUwNjdiZTk1MjgwZDc1ZjA0ZjNkNGU0M2E2OXwxMDE7OzE0NzIzMjg3Mjk7MjsxNDcyMjQyMzI5Ljk4NzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"