Thanks Frank, Daniel and Oliver,
I'm sure that my data has topology errors. I'm using pure MS4W and my method is
PHPMapscript. My small application is only for zoom, pan.
In my experience, I also think MapServer or any mapping engine can draw a
request map without checking its topology for legal
I still get this error now ( I use MS4W v2.3.1 - mapserv 5.2.1 ).
My data source is a .mdb Personal Geodabase file. This is the first time I use
this kind for input. I found the map engine doesn't work stably and this error
appears frequently. Sometime the error not shown but some features in the
