Error at calibration (Help)

[Normandes Junior]

It's happening an error at calibration of ARToolkit.
Follow the error below:

Debug Assertion Failed

Program: C:\Programas\ARToolkit\ARToolkit2.52vrml\bin\calib _cparam.exe
File: c:\program files\microsoft visual studio\vc98\atl\include\atlbase.h

Expression: p! = 0

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.


* But I don't have this file installed: File: c:\program files\microsoft visual studio\vc98\atl\include\atlbase.h
* I use Windows XP Pro SP2
* ARToolkit 2.52
* And I've already done the first calibration using calib_distortion.exe

What can I do?
PS: I'm brazilian and I don't write english very well, so I'm sorry.

[Normandes Junior]

I was thinking if the camera can cause this problem. I'm using a camera for AIPTEK. It is a digital camera with a webcam.
What do you think?