Based on the question: https://forum.plantuml.net/15215/ditaa-parsing-errors
I did try something as well and saw that an example like:
@startditaa
/-----------------\
| Things to do |
| cGRE |
| o Cut the grass |
| o Buy jam |
| o Fix car |
| o Make website |
\-----------------/
@endditaa
works
but
@startuml
ditaa
/-----------------\
| Things to do |
| cGRE |
| o Cut the grass |
| o Buy jam |
| o Fix car |
| o Make website |
\-----------------/
@enduml
doesn't.
This looks like to be caused by the backslashes.
Used version 1.2021.17beta4