Kaltura_Client_Exception thrown

Invalid KS "NWI2MGRhNTRjMzA3YjNlNmFiNWVmMDhmNjg5YjA4MmUwZWM1ZmZmMHwxMDE7OzE1MDEwMjM1NzQ7MjsxNTAwOTM3MTc0LjcxMDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"