Kaltura_Client_Exception thrown

Invalid KS "ZGE5NjM3NGFjMDJhMDc5N2VlYjJkMWZiODI0YzRiM2JkMDhmMmNmM3wxMDE7OzE0OTMxOTYwNjM7MjsxNDkzMTA5NjYzLjQ4NTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"