Kaltura_Client_Exception thrown

Invalid KS "NWQ2OGU1MWY4NTlmNDcwYzgyZDA4ZjFhNzg1MmNkZDAyM2I4NDFjMXwxMDE7OzE0NjcyNTg1Mjk7MjsxNDY3MTcyMTI5Ljk1NDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"