Kaltura_Client_Exception thrown

Invalid KS "Yzc1NDY5NzgwNzQxNzA0NjEyNzEzZjc5Y2MxYTg1YTFkNTE5ZmFhOHwxMDE7OzE0NzI3MTIxMzI7MjsxNDcyNjI1NzMyLjIxNDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"