Kaltura_Client_Exception thrown

Invalid KS "NzUwNGFkNTEyYjgyNmJjYTA2MjgwNzk1MDk5NTJiNDc4MjE0MDVjOHwxMDE7OzE0NzUxMjgyNDY7MjsxNDc1MDQxODQ2LjgyNjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"