Kaltura_Client_Exception thrown

Invalid KS "ZGY1MDU2YTcyOTJlMDhkOGMxZGE4ZTg3MTU0NjI2MGVlMGI3Y2FmN3wxMDE7OzE0NzUxMzI5Njc7MjsxNDc1MDQ2NTY3LjAzNTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"