The question is which file is this line of code giving you the problem?
I suspect that it is more from including the right header files at the right time.
BTW "eoclient.cpp" is looking for the file #include "eodroid.hpp" , but this was not in the zip file you sent me.
I found several ".hpp" files with the line #include "stdafx.h" . This is a VS only file and must be the first line of the ".cpp" file. When you put this in a ".hpp" file you are including it to late and it should never be in a ".hpp" file.
As highwayman says you need the code that contains the error. More to the point the beginning of the file with the #includes.
With the changes I have made so far the processor.SetSeqStart(eid_low); is not an error.