Kaltura_Client_Exception thrown

Invalid KS "ZjM2NzQ1NzQ1YmRjZTk3NzQzOTA3MjAxMDU4ZDczMWEzMmU4MmFiMHwxMDE7OzE0NzQ4NTAwNTE7MjsxNDc0NzYzNjUxLjE1MDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"