Kaltura_Client_Exception thrown

Invalid KS "NTI2OTJjZTk0ZjI0MmQwZmU3MzlhOTFiOGY1Y2FiNDM5ZDE5MmNhM3wxMDE7OzE0OTAzNzQzMTk7MjsxNDkwMjg3OTE5LjUwMDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"