h2. Expected Behavior

Gantt-Diagramm converts to png file format.

h2. Actual Behavior

Clicking on the png link at the bottom of the Gantt page causes an error.

h3. Essentials of Error Message

MiniMagick::Error in GanttsController#show
.../tmp/mini_magick20200415-1-ufk9mt.png failed with error: convert-im6.q16: unable to read font helvetica' @ error/annotate.c/RenderFreetype/1333. convert-im6.q16: non-conforming drawing primitive definitiontext' @ error/draw.c/RenderMVGContent/4301.

See the two attached sreenshots of the very long error message.

h2. Steps for Reproduction

Install Redmine according to the Technical Details below with a database populated only be Redmines default data¶

Define a Project by only setting a name¶

Create a Ticket by only setting name and due date¶

Go to Gantt page and click the png link at the bottom¶

h2. Technical Details

Redmine 4.1.1.stable
Default administrator account changed

Attachments directory writable

Plugin assets directory writable (./public/plugin_assets)

MiniMagick available (optional)

ImageMagick convert available (optional)

ImageMagick PDF support available (optional)

Environment:
Redmine version 4.1.1.stable
Ruby version 2.5.8-p224 (2020-03-31) [x86_64-linux]
Rails version 5.2.4.2
Environment development
Database adapter Mysql2
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
SCM:
Subversion 1.10.4
Mercurial 4.8.2
Git 2.20.1
Filesystem

Redmine plugins:
no plugin installed