Kaltura_Client_Exception thrown

Invalid KS "NTMxYzRmNTExYWQyZWFmMDJiZGUzZGMyMzE2Y2FmZmFiYmRiMDcxZXwxMDE7OzE1MDEzMjY1MTc7MjsxNTAxMjQwMTE3LjI5Mzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"