What does visitFunction error mean?

Running Node.js@0.8.15 + Express@3.0.4 + Jade@0.27.7 + Stylus@0.31.0. For some reason getting the following error. Does anybody know what this means?

I don't think I am doing anything weird. This is occurring when I am doing: res.render(view, response);

Property 'visitFunction' of object #<Object> is not a function
    at Object.Compiler.visitNode (/app/node_modules/jade/lib/compiler.js:176:32)
    at Object.Compiler.visit (/app/node_modules/jade/lib/compiler.js:161:10)
    at Object.Compiler.visitBlock (/app/node_modules/jade/lib/compiler.js:253:12)
    at Object.Compiler.visitNode (/app/node_modules/jade/lib/compiler.js:176:32)
    at Object.Compiler.visit (/app/node_modules/jade/lib/compiler.js:161:10)
    at Object.Compiler.compile (/app/node_modules/jade/lib/compiler.js:78:10)
    at parse (/app/node_modules/jade/lib/jade.js:101:23)
    at Object.exports.compile (/app/node_modules/jade/lib/jade.js:163:9)
    at Object.exports.render (/app/node_modules/jade/lib/jade.js:215:17)
    at View.exports.renderFile [as engine] (/app/node_modules/jade/lib/jade.js:243:13)

One of the reasons why you may get that error is because you added new properties (usually methods) to Object.prototype

Example: 

Object.prototype.someNewMethod = function (value1, value2) {
    // ... perform some operations
    return this;
};

That way of adding new properties to Object is not recommended as stated in issue #1033 for express project. Object.defineProperty should be used with enumerable set to false instead.

Example of extending Object with Object.defineProperty 

Object.defineProperty(
    Object.prototype, 
    'someNewMethod',
    {
        writable : false,
        // Will not show up in enumerable properties (including for-in loop).
        enumerable : false, 
        configurable : false,
        value : function (value1, value2) {
            // ... perform some operations
            return this;
        }
    }
);

I had exactly the same problem and using Object.defineProperty with enumerable:false to define new properties resolved the issue.

I hope that will help.