Kaltura_Client_Exception thrown

Invalid KS "MjY5OTAzZDE1OTcxNGE3ODFjY2RmMjYyMGU3OTQ5MjdhZmVhNWYzZnwxMDE7OzE0NzIxNjI1MzU7MjsxNDcyMDc2MTM1LjExODE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"