Kaltura_Client_Exception thrown

Invalid KS "MDE0M2VkZjgyZmI2OGExYWUzZTA2OWQ3YWQ2ZGZjYjRjZDg1N2ZlN3wxMDE7OzE0OTgzMzcwMTk7MjsxNDk4MjUwNjE5LjE5MTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"