Kaltura_Client_Exception thrown

Invalid KS "MjRiMTJkM2U5YzVmYjkxMGNkNzc0MWQ1NmM5OTRkNzg0M2YyMTI3ZnwxMDE7OzE0NzUwMzUxMjA7MjsxNDc0OTQ4NzIwLjM1NTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"