Kaltura_Client_Exception thrown

Invalid KS "ZDcwNDkxYjUzODg5YWU1NTA4ZDc1MWQ5YTdlMGRkNWU4OTQ1M2E0NnwxMDE7OzE0NzQ4ODE0MTc7MjsxNDc0Nzk1MDE3LjgzMDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"