Hello,
I presume that you see this recommendation :
As you are on a ARM platform and that this converter is an external tool, you have to check that this tool is available on your system, i.E. you should have java and jodconverter.jar.
Where is your reference to pyconverter? Did you follow another tutorial?
Then, you have to be sure that Dolibarr find them.
You can activate logs registration in Setup / Modules to perhaps have more explicit messages of the error.
