我想通过读取csv创建节点，节点以phone属性作为唯一性标识，代码如下： using periodic commit load csv from “file:///test.csv” as line create constraint on(sender:Person{name:line[3],addr:line[4],phone:line[5]}) assert sender.phone is unique create constraint on(receiver:Person{name:line[9],addr:line[10],phone:line[11]}) assert receiver.phone is unique create (sender) - [r:RELTYPE {time:line[0],code:line[1],channel:line[2],weight:line[6],value:line[7],des:line[8]}]->(receiver)

然后发现报出错： 请各位解答以下，谢谢啦~