Kaltura_Client_Exception thrown

Invalid KS "YTJjZDhjNTRhZDhjZDVjZjdhZWQwZjA5ZGI2ZjFiMDY2YmI3Y2Q0M3wxMDE7OzE0NzU0MTc0NjU7MjsxNDc1MzMxMDY1LjczMjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"