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The main reason of error 2019 for opencv project is because erroring in linking the lib files. Several reasons may: 1. path to the libs not correct 2. lib file name not correct 3. missing any lib files 4. x86 or x64 libs linking mistake 5. runtime library, i.e. multi-threaded debug dll (/mDd) , have to set correct in debug or release 6. checking your code, if missing :: before class member functions