Kaltura_Client_Exception thrown

Invalid KS "ZDg0ODgyN2QwYjE1MTMzNmM4ODU3MzM4ZGM5MTM1MzgzMTA4OTYzZnwxMDE7OzE0OTA2MTI3Mjk7MjsxNDkwNTI2MzI5LjE5MzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"