Newbie question

[anteje]

I'm new in the PI. I'm just starting to learn,  following Harry's tutorials.
I tried to align and stack one of my photos just for learning.
But immediately arrives problem: what is wrong with my fits files ? (see below and attached screenshoot)
Or where did I go wrong?

PixInsight Core 01.08.00.1023 RC7 Ripley (x64)
Copyright (C) 2003-2013 Pleiades Astrophoto
----------------------------------------------------------------------
Welcome to PixInsight. Started 2013-stu-13 08:00:41 J2456609.83381 UTC

* Parallel processing enabled: Using 4 logical processors.
* Thread CPU affinity control enabled.
* PSM AutoSave enabled. Auto-save period: 30 seconds.

StarAlignment: Global context
Loading reference image:
C:/Users/Ante/Pictures/2013-11-08/Maxim/m31-001lum.fit
*** PCL Exception: PCL FITS Format Support: Unable to open FITS file:
C:/Users/Ante/Pictures/2013-11-08/Maxim/m31-001lum.fit
CFITSIO error message stack:
01 : Extension doesn't start with SIMPLE or XTENSION keyword. (ffrhdu)
02 : SIMPLE?=?T²BITPIX?=?16/8unsignedint,1632int,-32-64real?NAXIS?=?2/n
03 : ffopen could not interpret primary array header of file:
04 : C:\Users\Ante\Pictures\2013-11-08\Maxim\m31-001lum.fit
05 : This does not look like a FITS file.
<* failed *>

Thanks for any help

[pfile]

the fits file was probably saved with compression turned on... if you can re-open them with maxim and save as i16 with no compression you should be good.

rob

[anteje]

Yes, you are right. Everytging OK now. Thank you very much.
Regards

[pfile]

excellent!