Kaltura_Client_Exception thrown

Invalid KS "OTQyMTRjOTA5ZTIzMWFiNmI2MTI0YWQ1MmQzMDQ0YmY1Zjc3MTgyMHwxMDE7OzE0NzQ5NDgyMjU7MjsxNDc0ODYxODI1LjU1NDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"