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Hi Dornhege's

I have tried to do as you have advised. In particular, the appropriate code line in my launch file is:

<rosparam file="$(find guiPackageParametersToCallback)/topicList.yaml" command="load" />

But I receive a strange error, while launching this file:

error loading <rosparam> tag: 
    'param' attribute must be set for non-dictionary values XML is <rosparam command="load" file="$(find guiPackageParametersToCallback)/topicList.yaml"/>

I don´t understand the meaning of the error...

All the others:

Maybe there is a way to solve my problem in the initial way?

Thank you all, Felix.