从R写入sql表时出现未知错误

Question

要在SQL Server中打印sql表，我编写了以下函数：

writeTableSql <- function(table, dat, tablename){
#libraries
 library(RODBC)
 library(ETLUtils)
 library(ff)
 dat[] <- lapply(dat, function(x) if (is.character(x)) as.factor(x) else 
  {x})
 ETLUtils::write.odbc.ffdf(x = ff::as.ffdf.data.frame(dat), tablename = 
   tablename, odbcConnect.args = list(dsn = table, uid = "uid", pwd = 
    "***"))

}

writeTableSql("DDBBname", my_df, "table_name")

它正在运行时会停止，并在控制台中说：

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有人猜怎么着呢？