运行此示例时https://github.com/JakSprats/node_Redisql/blob/master/examples/redisql_examples.js给我这个错误，~/rahul$noderedissql.jsnode.js:178throwe;//process.nextTickerror,or'error'eventonfirsttick^ReferenceError:lenisnotdefinedatcheck_argc(/usr/local/lib/node/.npm/redisql/0.0.1/package/index.js:18:62)atRed