Kaltura_Client_Exception thrown

Invalid KS "NmFmMDY1YWJmZGQxNzkyZWE4OWE5NDJlYjEyYzExMjIzNTM1Nzk1MnwxMDE7OzE0NzUwMjg1ODY7MjsxNDc0OTQyMTg2LjI0ODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"