Kaltura_Client_Exception thrown

Invalid KS "OTA2ZDFlNjVmNjA4NjEyZDJmNzE0ZGUyNzc5ODcwNzVjZmMwNTQ5ZHwxMDE7OzE0NzQ4NjI2NTU7MjsxNDc0Nzc2MjU1LjU2NTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"