error C2664: 'cv::imread' : cannot convert parameter 1 from 'wchar_t *' to 'const std::string &'

edit

hello,

I am getting error as state above. here he the fraction of the code, in header file there is class:

 class projectresults
{
public:
    std::wstring TubeType;
    double VolumeHeightMM;
};

class project
{
public:
     project(void);
    ~project(void);


    projectresults process(std::list<projectparameter>& ParameterSet, wchar_t *imgName);

    double contour();   
    double plazmaH, Y02;

};

in .cpp file there is defination

projectresults project::process(std::list<projectparameter>& ParameterSet, /*char* imgName*/  wchar_t *imgName)
 {
    Mat imgOriginal =imread(**imgName**, 1);

please guide me how can I solve this error.

Thank you very much in advance.