Kaltura_Client_Exception thrown

Invalid KS "M2QxNzcyMDBkMjVjOWY4NzcxMDg4NzY0NmU1NWMzNjM4ZjdkYTQ1ZHwxMDE7OzE0OTMzNzczOTI7MjsxNDkzMjkwOTkyLjA5NDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"