Lexicon: a customizable native mobile app for your Discourse site

I tried to configure Lexicon mobile app following the Tutorial given on Lexicon. After completing all the steps and launching mobile app for a free discourse instance(https://meta.discourse.org/), I am getting these error on the phone and terminal log respectively.
lexicon_mobile

Terminal error:

None of these files exist:

\generated\server\globalTypes(.native|.android.js|.native.js|.js|.android.json|.native.json|.json|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx|.android.svg|.native.svg|.svg)

src\generated\server\globalTypes\index(.native|.android.js|.native.js|.js|.android.json|.native.json|.json|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx|.android.svg|.native.svg|.svg)
 5 | import { DEFAULT_CHANNEL } from '../constants';
  6 | import { Text } from '../core-ui';
>  7 | import { TopicsSortEnum } from '../generated/server/globalTypes';
    |                                 ^
   8 | import {
  9 |   anchorToMarkdown,
  10 |   errorHandler,
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