Kaltura_Client_Exception thrown

Invalid KS "Nzk0NGM2NzZmNjk5NTRmZGNlNWJlNGU3YzRhYmM3YTJhY2QwZDcyNXwxMDE7OzE0NzU0MzY5MzQ7MjsxNDc1MzUwNTM0LjQxNDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"