Kaltura_Client_Exception thrown

Invalid KS "OTlhMTM2ZWQwNDU4N2NkNmE0OTAwNGY2OTFmMjFiMTQxMDhkMGFiM3wxMDE7OzE0NzUwNzc1ODc7MjsxNDc0OTkxMTg3LjU5OTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"