我正在将GPS位置数据写入Arduino项目中的SD卡。它失败

So I am writing GPS data (latitude and longitude) to a SD card in an Arduino project. I want to write the header for the KML file (which is storing the GPS data). I have two dataFile.println commands (as shown below). I can comment out one of the lines and then the other line will be correctly written to my SD card. But if I have both lines then dataFile will be false (I am assuming it will be null?) and neither line below will write to the SD card. What am I doing wrong? So I am writing GPS data (latitude and longitud