Kaltura_Client_Exception thrown

Invalid KS "ZTRmOGZkN2MyOTgxMjgzMzI4MDRjNzRmYjMxMTM2ZTQyY2RkZTI1ZHwxMDE7OzE0OTU5NDgyMTQ7MjsxNDk1ODYxODE0LjQzMDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"