TS doc make error

gistfile1.txt

wkaras ~/TS6/doc
$ make clean
Making clean in .
make[1]: Entering directory `/home/wkaras/TS6/doc'
rm -rf .libs _libs
rm -rf docbuild/* _build/html/* xml
rm -f *.lo
make[1]: Leaving directory `/home/wkaras/TS6/doc'
wkaras ~/TS6/doc
$ make html
make[1]: Entering directory `/home/wkaras/TS6/doc'
PAPEROPT_a4="-t latex_a4" PAPEROPT_letter="-t latex_letter" PAPER="letter" PLANTUML_JAR="/home/wkaras/TS6/.git/doc-tools/plantuml-1.2018.1/plantuml.jar" ./sbuild sphinx-build -c .  -d docbuild/doctrees -b html . docbuild/html
Running Sphinx v1.6.3
making output directory...
Skipping optional fixer: buffer
Skipping optional fixer: idioms
Skipping optional fixer: set_literal
Skipping optional fixer: ws_comma

Extension error:
Could not import extension sphinxcontrib.plantuml (exception: No module named 'sphinxcontrib.plantuml')
make[1]: *** [html-local] Error 1
make[1]: Leaving directory `/home/wkaras/TS6/doc'
make: *** [html-recursive] Error 1
wkaras ~/TS6/doc
$