How to resolve such exception?

[User 14020345]

Unhandled exception at 0x01F523BC (mfc140d.dll) in MProSet.exe: 0xC0000005: Access violation reading location 0xCDCDCDD1.

[CPallini]

Your program is trying to access invalid memory. You should post the relevant code for further help.

[Lost User]

You are likely trying to use an uninitialised pointer.

[Victor Nijegorodov]

There are some [Magic number (programming) - Wikipedia](https://en.wikipedia.org/wiki/Magic\_number\_(programming)) that one could find out while debugging (just look for "Microsoft" there)