Cannot compile in Release mode

Dear Experts,

I have a VC++ application. I compiled and tested it in Debug mode without problems. Now as I need to make a release version, the compiler gives me many errors. E.g. here is the first one:
      CString strLastPage;
      strLastPage.Format("%d", pSheet->m_pPDFDoc->getNumPages());

Error      16      error C2664: 'void ATL::CStringT<BaseType,StringTraits>::Format(const wchar_t *,...)' : cannot convert parameter 1 from 'const char [3]' to 'const wchar_t *'      c:\Projects\VisualPDFConverter\VisualPDFConverter\WizPgSelectPageRange.cpp      59

Could you tell me why I am having this problem?
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Is your debug version using multibyte and your release version using unicode?
The release version seems to be set to compile as UNICODE whereas your debug version uses MBCS. Open your project settings (ALT+F7), go to 'Configuration Properties|General" and change 'Character Set' to 'Use Multi-Byte Character Set'.

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tantormediaAuthor Commented:
Thank you very much!
Could you tell how it even happened that I had different settings for Debug and Release? I didn't do it.
Hm, UNICODE is the default for more recent versions of Visual Studio, so I guess at one point you switched the debug version to MBCS accidentally or without really noticing it...
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