Kaltura_Client_Exception thrown

Invalid KS "YjQxMjg3MGQ2YmYzMDcxYmZkYzljYzRkNjAwMTIyYThhYmE1ZWMyMHwxMDE7OzE1MDEwMzE1OTY7MjsxNTAwOTQ1MTk2LjQxMDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"