On a brand new clean installation of PIWIK 2.0.2, displaying the initial installation Welcome screen results in the error:
PHP Fatal error: Call to a member function rewriteAssetsPathToTheme() on a non-object in ..../piwik/core/AssetManager/UIAssetMerger.php on line 181
This occurs on my main production server running and on my test machine running Xampp
The error is repeated multiple times - possibly for each of the screens in the installation sequence. Once installed, the error message does not reappear.
In 09abd7abef8ee6f6f3b9c9531798233dc84a551d: Fixes #4453 During installation, the theme is not yet ready to be used.
thanks for the report!