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[VideoCapture::open][Qt Creator]Debug Assertion Failed (unsigned)(c+1) <= 256

I try to use cv::VideoCapture::open("path to file"). Even though the program runs without errors in bebug mode, it gives below runtime error in release mode.

Debug Assertion Failed File: f:/dd/vctools/crt_bld/self_x86/src/isctype.c Line: 56

Expression: (unsigned)(c+1) <= 256

-----------------------------------------------pro file-------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = untitled TEMPLATE = app

SOURCES += main.cpp\ mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

INCLUDEPATH += C:/C/opencv/build/include INCLUDEPATH += C:/C/opencv/build/include/opencv

LIBS += C:/C/opencv/build/x86/vc10/lib/opencv_highgui240d.lib LIBS += C:/C/opencv/build/x86/vc10/lib/opencv_highgui240.lib

---------------------------------------------Erroneous line ---------------------------------------"C:/Users/ANURUDDHA/pedestrians/ped-crossing1.jpg"); // where cv::VideoCapture vcap;

error occurs ONLY IN RELEASE. It runs without errors in debug mode.

I have added C:\C\opencv\build\x86\vc10\bin; to system path which contains opencv_ffmpeg240.dll and other .dll

Really appriciate your kind assistance, will save a lot of time.. Thanks in advance.