Help modifying Skype orientation mode

Hi. I'm new to this forum and I hope I can be precise and clear.

The new update of Skype forces us to use the app in landscape mode, which is kind of annoying. Searching on Google, I found that there are mainly two ways to force the app to keep portrait mode: using another app to control orientation or modifying this setting in Androidmanifest.xml file. I went for the second option.

Then, following a first tutorial (with apktools) , I was able to decompile the Skype apk, and add android:screenOrientation="portrait" to the XML file, as you can see in the pic, and recompile it. The problem is that when I tried to reinstall Skype using the modified apk, I got the error "application not installed", as you can see below.

Following a second tutorial (using apktools) , I decompiled the apk, added android:screenOrientation="portrait" to Androidmanifest.xml but when I tried to recompile I got the error "invalid resource directory name" (check out the print screen).

Any solutions? Am I doing something wrong? Thank you.

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