“First-chance exception” meaning in MFC Application?

Question

When I run my Windows Application(MFC) I get two Warnings.

First-chance exception at 0x01046a44 in XXX.exe: 0xC0000005: Access violation reading location 0x000

Answer 1

This error means, that code from ntdll tries to access virtual address 0x00000048, that is not accessible. Maybe you call some function from ntdll and pass invalid pointer as a parameter.