Kaltura_Client_Exception thrown

Invalid KS "Mjk4ZDdiY2QwZmFkNjc1OWQxYmRiNmI1YjhlNDQ5NzBiMmQ0N2VkMnwxMDE7OzE0NzU0NDg1MjM7MjsxNDc1MzYyMTIzLjYzOTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"