Kaltura_Client_Exception thrown

Invalid KS "ZDc2NzgwN2JiODQzMTYwNmFjZTk3ZDUwYTYzNTcxZDA0NjRmMDkzOHwxMDE7OzE0NzI2OTAzNDU7MjsxNDcyNjAzOTQ1LjE2OTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"