How do I solve this string as an expression.

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C++

MFC

VS2012

So I was running this code. GA Timetable which was originally running in 2008 but I run it in visual 2012. So I'm guessing there is some kind of a compatibility problem. So, below is the coding problem part.

bool Configuration::GetConfigBlockLine(ifstream& file, string& key, string& value)
{
    string line;

    // end of file
    while( !file.eof() )
    {
        // read line from config file
        getline( file, line );
        TrimString( line );

        // end of object's data
        if( line.compare( "#end" ) == 0 )
            return false;

        size_t p = line.find( '=' );
        if( p != string.npos )
        {
            // key
            key = line.substr( 0, p );
            TrimString( key );

            // value
            value = line.substr( p + 1, line.length() );
            TrimString( value );

            // key - value pair read successfully
            return true;
        }
    }

    // error
    return false;
}

error is here

c:\users\zahrina\documents\visual studio 2012\projects\gaschedule\gaschedule\algorithm\configuration.cpp(272): error C2275: 'std::string' : illegal use of this type as an expression
          c:\program files\microsoft visual studio 11.0\vc\include\xstring(2300) : see declaration of 'std::string'
c:\users\zahrina\documents\visual studio 2012\projects\gaschedule\gaschedule\algorithm\configuration.cpp(272): error C2228: left of '.npos' must have class/struct/union