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Ok. Thanks for showing us the actual error.
This has most likely nothing to do with quotes or not.
The cause is here that you're trying to start a script that is not equipped to deal with roslaunch args with roslaunch.
Notice this part in the error message:
unrecognized arguments: __name:=makeSoundRequest __log:=/home/nvidia/.ros/log/0681ca48-10f0-11ea-8929-00044bc771c7/makeSoundRequest-1.log
Those arguments (__name and __log) are added by roslaunch to the command line used to invoke your script. So in the end, the complete command line used to invoke your script becomes:
/absolute/path/to/makeSoundRequest.py __name:=makeSoundRequest __log:=/home/nvidia/.ros/log/0681ca48-10f0-11ea-8929-00044bc771c7/makeSoundRequest-1.log --text 'please say something' --label mode1
As your script doesn't expect those extra arguments, it fails with the error message that you show.
You could either do what @Delb suggests (ignore "unknown args"), or properly handle them using an approach similar to what is described in #q272267.
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