Kaltura_Client_Exception thrown

Invalid KS "NDNjYjA2MGQwN2YwZjU3YWEyYTQxMWVmZGEzYWQwMGNkMTBkYTJjYXwxMDE7OzE0OTU4MjI1NTc7MjsxNDk1NzM2MTU3Ljk1NjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"