Kaltura_Client_Exception thrown

Invalid KS "NTY2YzkwNzcyYTI5NTBiYmQ4ZTAzYzNjYmFmNzkyMDllZDI3M2VhOXwxMDE7OzE0NzUxMzI5MDQ7MjsxNDc1MDQ2NTA0Ljk2ODQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"