Kaltura_Client_Exception thrown

Invalid KS "YTU4NjI5Y2U0ZDhjZDg2MGU0NTAyYmIyMjI5ODVkMGRhMTkwMzE3ZHwxMDE7OzE1MDEyMDIzMDg7MjsxNTAxMTE1OTA4LjM4NTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"