问发布模式下的Visual Studio C++ 2010编译错误

EN

c:\program files\point grey research\flycapture2\include\Error.h(38): error C2059: syntax error : 'string'
1>c:\program files\point grey research\flycapture2\include\Error.h(39): error C2146: syntax error : missing ';' before identifier 'Error'
1>c:\program files\point grey research\flycapture2\include\Error.h(39): error C2470: 'Error' : looks like a function definition, but there is no parameter list; skipping apparent body
1>c:\program files\point grey research\flycapture2\include\BusManager.h(56): error C2059: syntax error : 'string'
1>c:\program files\point grey research\flycapture2\include\BusManager.h(57): error C2146: syntax error : missing ';' before identifier 'BusManager'

namespace FlyCapture2
{
    struct ErrorImpl;

    /**
     * The Error object represents an error that is returned from the library.
     * Overloaded operators allow comparisons against other Error objects or
     * the ErrorType enumeration.
     */
    class FLYCAPTURE2_API Error
    {
    public:

        /**
         * Default constructor.
         */
        Error();

        /**
         * Copy constructor.
         */
        Error( const Error& error );

        /**
         * Default destructor.
         */
        virtual ~Error();