Kaltura_Client_Exception thrown

Invalid KS "YzM5ZTcxYTc0ZGM4NjNjZDc2MWRlMjIxODdkZTU1NDZiMWI1Yzc4MXwxMDE7OzE0OTg3MjczMDQ7MjsxNDk4NjQwOTA0LjAxNTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"