Kaltura_Client_Exception thrown

Invalid KS "MGU5YmYyYWFmYzM1NDBjZWQ3N2M5ZWQ1YmM5MTk3ODU3ZjI0ZWU1ZXwxMDE7OzE0NzU0MDUxNDM7MjsxNDc1MzE4NzQzLjAwMTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"