WARNING: plantuml command 'plantuml' cannot be run [plantuml]

[sofianehamam]

git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
cd trusted-firmware-a

vi docs/requirements.txt

paste:

sphinx
myst-parser
sphinx-book-theme
sphinx-copybutton
sphinx-togglebutton
sphinx-design
sphinxcontrib.plantuml

sudo apt-get -y install librsvg2-bin
pip install -r docs/requirements.txt
cd docs
make latexpdf

Issue :

WARNING: plantuml command 'plantuml' cannot be run [plantuml]