How to fix Assertion Failure Opencv Programming - Visual C++ 2008 Express -


i made windows form based program load image using opencv in visual c++ 2008. but, following code failed load image, , got assertion failure. 

private: system::void buttoncitra_click(system::object^  sender, system::eventargs^  e) {     if (openfiledialog1->showdialog() == system::windows::forms::dialogresult::ok)     {         //error detected here variable citra          citra = cv::imread(marshalstring(openfiledialog1->filename));         pictureboxcitra->image = iplimagetobitmap(&(iplimage) citra);         this->width = pictureboxcitra->image->width+33;         this->height = pictureboxcitra->image->height+85;     } }

when compile , build it, nothing happened, , form appeared properly. when chose image using openfiledialog in directory file, got dialog box titled "microsoft visual c++ debug library" contains assertion failure,as follow : 

"debug assertion failed! program: .....try.exe file f:\dd\vctools\crt_bld\self_x86\crt\src\fopen.c line 53 expression: (file!=null)"


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