连接人大金仓失败

```c#
public class DB
{
static Lazy bizLazy = new Lazy(() =>
{
var fsql = new FreeSql.FreeSqlBuilder()
//.UseMonitorCommand(cmd => Trace.WriteLine($"Sql：{cmd.CommandText}"))
.UseConnectionString(FreeSql.DataType.KingbaseES, @"Server=127.0.0.1;Port=54321:UID=SYSTEM;PWD=123;database=OA;MAXXPOOLSIZE=2")
//.UseAutoSyncStructure(true) //自动同步实体结构到数据库，只有CRUD时才会生成表
.UseNameConvert(FreeSql.Internal.NameConvertType.ToLower)
.Build();
return fsql;
});
public static IFreeSql Biz => bizLazy.Value;
}

var fsql = DB.Biz;
fsql.Select()
.WithSql("select name from oa_inst.temp_flow").ToList();
```

执行查询的时候提示 Status unavailable, waiting for recovery.The input string '' was not in a correct format.错误
使用 FreeSql.Provider.Custom方式同样报错。是哪里的问题？