Runtime Library Link — Microsoft C++

dir "%programfiles(x86)%\Microsoft Visual Studio\2019\*" If you provide the or a log snippet with the error, I can give a more targeted root cause analysis.

// BAD class Base Base() callMe(); virtual void callMe()=0; ; // GOOD class Base void init() callMe(); virtual void callMe()=0; ; Run System File Checker : microsoft c++ runtime library

.symfix .reload !analyze -v Look for the module that called into the runtime (e.g., MyApp.exe calling msvcp140!std::string::assign ). Use ListDLLs (Sysinternals) or Process Explorer : virtual void callMe()=0