Kaltura_Client_Exception thrown

Invalid KS "YmQwNjkxN2Y0ZTM0MWIwMmU0ODMwNGY4ZGM4OTdiZWQxOWJmYzBlY3wxMDE7OzE0NzUxNTcxMjU7MjsxNDc1MDcwNzI1LjM4MDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"