Kaltura_Client_Exception thrown

Invalid KS "NDc1Mjc0OTk0MGVkZjMzODY5ODVhMzVmMzI3ZDQ4NTk0OTE2Yjk4ZnwxMDE7OzE0Njk5Nzc4NjQ7MjsxNDY5ODkxNDY0LjM1ODY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"