Vanilla New Version Installation Error

I'm getting error while trying to install new version of vanilla
Fatal Error in Vanilla\Theme\FsThemeProvider.getThemeAddon();
Theme not found.
The error occurred on or near: /home/hellotounce/public_html/library/Vanilla/Theme/FsThemeProvider.php
96: if (!$theme) { 97: // Try to load our fallback theme. 98: $theme = $this->addonManager->lookupTheme(ThemeService::FALLBACK_THEME_KEY); 99: if (!$theme) { 100: throw new NotFoundException("Theme"); 101: } 102: } 103: 104: return $theme;
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