Kaltura_Client_Exception thrown

Invalid KS "YmI3NzgxNGVmYWZkYmY0MWRhM2FmNGE0ZjQyMWVhOTEyOGUwODM3ZHwxMDE7OzE0NjczODMyNTA7MjsxNDY3Mjk2ODUwLjMyNDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"