Kaltura_Client_Exception thrown

Invalid KS "NDAzMzBjYTAzYzhmNTAxYzQwZDIxYjVmMmMzZmI0MGVhNDRhODJkZnwxMDE7OzE0ODE1MDMzNzQ7MjsxNDgxNDE2OTc0Ljg5Mjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"