Kaltura_Client_Exception thrown

Invalid KS "ZTc2ZTIxZDJhYjg2N2QxYzllZTkyNjkwNjk3MDBhZWQxZWEzZmE0OHwxMDE7OzE0OTg2MzM0NTk7MjsxNDk4NTQ3MDU5LjM0MDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"