使用ArcToolbox下面的Conversion模块时出错

<P>使用ArcToolbox下面的Convertion模块做ASCII to Raster转换时出错。出错提示如下：</P>
<P>Executing (ASCIIToRaster_1): ASCIIToRaster E:\temp\GISData\20070503.txt E:\temp\GISData\ASCIITo_20071 INTEGER<BR>Start Time: Tue Mar 03 21:00:51 2009<BR><FONT color=red>An error was encountered while executing ASCIIToRaster.<BR>("esriGeoAnalyst.GridEngine") <BR>Error in executing grid expression<BR>Failed to execute (ASCIIToRaster_1).</FONT><BR>End Time: Tue Mar 03 21:00:51 2009 (Elapsed Time: 0.00 seconds)<BR>哪位遇到过以上情况啊？或者是类似的情况？帮忙解决一下，谢谢！</P>

你打开你的ascii文件看看，是否有特殊的字符，比如 ('.' or ',')等，如果有就用文本编辑器编辑掉再试下