Error Messages when including mongodb in c++ project

I've followed the steps to include mongoDB in my c++ project described in this questions. However, if I want to debug it, it autmatically stops because of an unhandled exeption. in the output section it says:

 Exception thrown at 0x0FB8AC5C (libmongoc-1.0.dll) in
 mongodb_test.exe: 0xC0000005: Access violation reading location
 0x00000038. Unhandled exception thrown: read access violation. Addend
 was 0x38.

Chances are low that it's because of the code I've used, because for testing purposes I copied the code from the MongoDB-Website.

It would be really helpfull if somebody could explain to me what this error means so I get more familiar with using mongoDB. Although a solution would be accepted too.

Thanks for your help in advance.