This is only the case in debug mode and will not be solvable without completely rewriting all views.
Vue is basically complaining about not being the only script instance running.

Its formed as an error, but in fact is only a warning.

https://stackoverflow.com/questions/40849885/vue-js-2-0-failed-to-compile-template
maybe it will help?

Fix committed to develop branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=25217

There is no issue with vue js it is just complaing over script tags in the template to render.
This may cause hazard, by memory leakage and incorrect rendering.
So far we had no issues and it never did any damage. Since I'm compiling our adminpanel with webpack it is all bound to a specific scope, so issues are most unlikely.

So this "Error" is actually just a warning that things may happen.
For some of the pages in the adminpanel it is resolved now. I will keep looking for issues and fix them accordingly.

If you stumble upon inlie scripts, just wrap them in the provided clientscript->render methods to avoid the vue error

Version 3.0.3 released.