wangchao213

``` java.lang.IllegalStateException: Only accept FileSource when convert String value to Date, but got 'com.baidu.hugegraph.loader.source.jdbc.JDBCSource' at com.google.common.base.Preconditions.checkState(Preconditions.java:172) ~[guava-11.0.2.jar:?] at com.baidu.hugegraph.util.E.checkState(E.java:68) ~[hugegraph-common-1.6.11.jar:1.6.11.0] at com.baidu.hugegraph.loader.util.DataTypeUtil.parseSingleValue(DataTypeUtil.java:119) ~[hugegraph-loader-0.10.1.jar:?] at com.baidu.hugegraph.loader.util.DataTypeUtil.convert(DataTypeUtil.java:65) ~[hugegraph-loader-0.10.1.jar:?] at com.baidu.hugegraph.loader.builder.ElementBuilder.validatePropertyValue(ElementBuilder.java:194) ~[hugegraph-loader-0.10.1.jar:?] at...