From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jarmo Hurri <jarmo.hurri@iki.fi>
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Date: Sat, 09 Nov 2019 10:10:56 +0200
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Greetings Terje.

Terje Larsen <terlar@gmail.com> writes:

> I noticed that I cannot run C-c C-c to convert plantuml source blocks
> since the commit (4e854974be9788f029f2d73f829c4d51d2b83faf), see changes
> at:
> https://code.orgmode.org/bzg/org-mode/commit/4e854974be9788f029f2d73f829c4d51d2b83faf#diff-9c9a333463276ff17be763269a5042f92a40817R73
>
> If I have a simple source block as such as:
>
> #+BEGIN_SRC plantuml :file output.png
> @startuml
> actor Foo1
> actor Foo2
> Foo1 -> Foo2 : Test
> @enduml
> #+END_SRC
>
> When I try to run C-c C-c I receive the following error message:
> org-babel-execute-src-block: Wrong type argument: char-or-string-p,
> nil

I started using plantuml in org last week (and am enjoying it greatly),
so take this with a hint of salt from a beginner. Still, at least in my
installation, your source code block works fine without '@startuml' and
'@enduml':

#+BEGIN_SRC plantuml :file output.png
actor Foo1
actor Foo2
Foo1 -> Foo2 : Test
#+END_SRC

All the best,

Jarmo