Kaltura_Client_Exception thrown

Invalid KS "ZDIxMjMzNmI0N2VkYzcxNmFiYjc5MTMxMTE4ZWRkMzQwNDM5ZjI4NXwxMDE7OzE0NzUzOTMyMzM7MjsxNDc1MzA2ODMzLjMyMTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"