Kaltura_Client_Exception thrown

Invalid KS "ZjdlM2YyNWQ2MGNkOTgyMWJiMDJhZWE1ZDhkZThjMjk1YjQ4MDExMnwxMDE7OzE0NzUzNjY2MjQ7MjsxNDc1MjgwMjI0LjM4OTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"