Kaltura_Client_Exception thrown

Invalid KS "MTc4YmM2OThiMzM5MzRkNmNmOWM3NDA3MmNhNTI1YWY1M2Y0ZWE1Y3wxMDE7OzE0NzUzODYwNzU7MjsxNDc1Mjk5Njc1LjI1ODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"