Kaltura_Client_Exception thrown

Invalid KS "MmM3YjhkNjcwNmI2NTg4Y2ZmNzMzNjE5OTkyZTc4NTY1YjAyNjczY3wxMDE7OzE0NzQ5Nzg3ODU7MjsxNDc0ODkyMzg1LjUzMTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"