Gantt diagram fails to render

[vesakivisto]

I'm trying to render a gantt diagram using MkDocs with plantuml-markdown extension at GitLab. The diagram renders succesfully on the .md file that contains the syntax, but it fails to render on GitLab pages which I create with MkDocs. It instead renders an image underscoring a line in the used syntax with "Syntax error?" text under it.

The syntax used is as follows:

```plantuml
[Prototype design] lasts 15 days
[Test prototype] lasts 10 days

Am I missing something here?

[mikitex70]

Maybe the plantuml.jar used is not recent enough: gantt diagrams are a recent introduction in plantuml. I don't know how pages are rendered in GitLab, but maybe they are using a different plugin, or maybe an old version of my plugin. Latest release of this plugin can use the plantuml server for rendering diagrams, and thus it always uses the latest jar version. A solution is to upload pre-rendered diagrams, but it isn't a real solution and producing documentation becomes a little tricky.

[vesakivisto]

Apparently adding the PlantUML server definition under plantuml_markdown to my mkdocs.yml fixed this issue. I guess MkDocs can't use the PlantUML server specified in GitLad configuration and it needs the definition in the mkdocs.yml.

[mikitex70]

It seems that GitLab uses a local version on PlantUML, too old to be able to render Gantt diagrams. Configuring the server remote url with the plantuml server url you are sure to always use the latest available version of PlantUML. I close this issue as is not related to this plugin, and there is a simple workaround to the problem. Thanks for your report, maybe it can be useful to others.