Kaltura_Client_Exception thrown

Invalid KS "ZDU0M2FlNGI1OThlZjZiZmI5MTUxOTcxMGRmNjAzNGJjMTc4YzM2ZnwxMDE7OzE0NzUyMDcwMTU7MjsxNDc1MTIwNjE1LjAzNTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"