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I'm working in Windows 10 using TexStudio on TexLive 2018 distro.
I'm writing my bachelor final thesis and I need to use a document class defined by my academic department. I have a .cls file named "Tptesi2.cls" and my .tex file starts with \documentclass[a4paper,oneside]{Tptesi2}.
The problem is that when I bring the mouse pointer on "Tptesi2", TexStudio show a little box that says

Class: Tptesi2 (non trovato)

that in italian means "class not found". The document is compiled with a warning

destination with the same identifier (name{page.i}) has been already used, duplicate ignored \relax l.91 \cleardoublepage [1

and it looks ok, but unfortunately I can't be sure of it because I don't have a thesis sample with this document class.
I gave a look to the folder C:\texlive\2018\tex\latex and I found many folders containing .cls files corresponding to document classes that are recognized by TexStudio, so I create a folder with the same "Tptesi2" and I put the file in it.
But this approach didn't work, so I tried to follow the steps described in Where do I place my own .sty or .cls files, to make them available to all my .tex files? but also in this way I didn't solved the problem. I'm missing some configuration on TexStudio or I put the file in the wrong folder, or both?

EDIT

TexStudio continues to show the same message, but I noticed that right clicking on the class name, left clicking on "show documentantion" the docs are showed correcly.

closed as off-topic by Troy, Stefan Pinnow, Andrew, TeXnician, Romain Picot Nov 28 '18 at 7:49

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    You can safely ignore this message from texstudio. If latex would not find the documentclass you would get a ton of error messages in the .log file and no sensible output. Actually I get this toltip for every documentclass, even for the standard latex classes. – user36296 Sep 7 '18 at 20:50
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    About the warning you get: this looks as if the same name is used for multiples labels. You should check this to make sure all the cross references go to the correct location. – user36296 Sep 7 '18 at 20:54
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    It would be better to place your .cls file not in C:\texlive\2018\tex\latex , otherwise it might be removed when you upgrade your tex distribution. – user36296 Sep 7 '18 at 20:55
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    @HJuls2 You can ignore it. But if it really bothers you, pass pageanchor=false when loading the hyperref package in your preamble. Or if hyperref is loaded inside Tptesi2.cls, you may try PassOptionsToPackage{pageanchor=false}{hyperref} before \documentclass{Tptesi2} in your .tex file. – Troy Sep 8 '18 at 13:46
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    I'm voting to close this question as solved in comments. – Troy Nov 28 '18 at 5:17