Kaltura_Client_Exception thrown

Invalid KS "MTdkNTkyNWM4MGVlZGExMmY2OWVmZTI1MDQ3NWUyMzU4MWY1Mzc5ZXwxMDE7OzE0NzUzNTQyNDc7MjsxNDc1MjY3ODQ3LjkxMTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"