Kaltura_Client_Exception thrown

Invalid KS "NjRiMzMxNDZhM2RhNTgzMTllZDU1NDhhYWRjYTlkZjIxYjRkMWE4YnwxMDE7OzE0OTM2NjU4MTk7MjsxNDkzNTc5NDE5LjIyNzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"