“function already has a body”

What does this mean?

1>c:\users\vitali\documents\visual studio 2010\projects\salam\tools.cpp(107): error C2084: function 'bool readXMLInteger(xmlNodePtr,const char *,int &)' already has a body
1>c:\users\vitali\documents\visual studio 2010\projects\salam\tools.h(52) : see previous definition of 'readXMLInteger'

tools.cpp(107):

bool readXMLInteger(xmlNodePtr node, const char* tag, int32_t& value)
{
    char* nodeValue = (char*)xmlGetProp(node, (xmlChar*)tag);
    if(nodeValue)
    {
        value = atoi(nodeValue);
        xmlFreeXOXL(nodeValue);
        return true;
    }

    return false;
}

tools.h(52)

bool readXMLInteger(xmlNodePtr node, const char* tag, int& value);

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