Loads the plugin from the proxy information that was created from the
        registry file.

def loadInstance(self):
        """
        Loads the plugin from the proxy information that was created from the
        registry file.
        """
        if self._loaded:
            return

        self._loaded = True
        module_path = self.modulePath()

        package = projex.packageFromPath(module_path)
        path = os.path.normpath(projex.packageRootPath(module_path))

        if path in sys.path:
            sys.path.remove(path)

        sys.path.insert(0, path)

        try:
            __import__(package)

        except Exception, e:
            err = Plugin(self.name(), self.version())
            err.setError(e)
            err.setFilepath(module_path)

            self._instance = err

            self.setError(e)

            msg = "%s.plugin('%s') errored loading instance from %s"
            opts = (self.proxyClass().__name__, self.name(), module_path)
            logger.warning(msg % opts)
            logger.error(e)