Kaltura_Client_Exception thrown

Invalid KS "YjZjYzQwNWQ5OGJiYmQ1ODUwZWEzNzMwMTE1Y2VhYzY2ZGJkZTg4M3wxMDE7OzE0OTAzNDM4ODU7MjsxNDkwMjU3NDg1LjY5NDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"