Kaltura_Client_Exception thrown

Invalid KS "MmE4NzMwZTFmN2VjMTJmOTM3MjEyYjdiYTE0ZDYwNDk0MDQ3NTBjMHwxMDE7OzE0NzUyMDEwOTc7MjsxNDc1MTE0Njk3LjY2MjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"