Lyx error

[Paolo M]

On opensuse 15, i have just installed the noto font, but probably lyx has
also been upgrated to 2.4.0-RC4.  Now lyx doe not work eny more.
Opening a file, see the enclosed one as an example, i get the error below
p.

---- Moreover, the pdf rendering cannot be viewenc. my error message

The selected document class
Article (Standard Class)
requires external files that are not available.
The document class can still be used, but the
document cannot be compiled until the following
prerequisites are installed:
article.cls
See section 3.1.2.2 (Class Availability) of the
User's Guide for more information.
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