Kaltura_Client_Exception thrown

Invalid KS "MDVhODA3MjZkNDJkNDRhMjI4MmI5MTczY2ZhY2E2MDc4YjI2NTRhOXwxMDE7OzE0NzUzNTQzNDI7MjsxNDc1MjY3OTQyLjgyOTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"