Error: Unable to access jarfile ~/.emacs.d/plantuml.jar

[clearmisp]

I have placed the plantuml.jar file in my .emacs.d directory. plantuml-mode have no problem running plantuml with path to plantuml.jar configured in init.el. But flycheck-plantuml fails to execute with the following error message:

Suspicious state from syntax checker plantuml: Flycheck checker plantuml returned non-zero exit code 1, but its output contained no errors: Error: Unable to access jarfile ~/.emacs.d/plantuml.jar

[tonight-halfmoon]

(setq plantuml-jar-path (concat (expand-file-name user-emacs-directory) "plantuml.jar"))

assuming user-emacs-directory's value is ~/.emacs.d/