Fatal error in 2.6.21 after restoring database

[kixe]

Trying to restore database from backup with Module ProcessDatabaseBackups PW 2.6.21 throws the following Fatal error:
Call to undefined method WireDatabaseBackup::trackException() in .../wire/core/WireDatabaseBackup.php on line 1098

(backup is from version 2.6.10)

After reloading the page I get the following error notices:

Modules: Configurable module check failed for SessionHandlerDB, retrying...
Modules: Configurable module check failed for FieldtypeRepeater, retrying...
Modules: Configurable module check failed for FieldtypePage, retrying...
Modules: Configurable module check failed for PageRender, retrying...
Modules: Configurable module check failed for SessionHandlerDB, retrying...
Modules: Configurable module check failed for MarkupCache, retrying...
Modules: Configurable module check failed for LanguageSupport, retrying...
Modules: Configurable module check failed for LoginNotifier, retrying...
Modules: Configurable module check failed for AdminThemeDefault, retrying...
Modules: Configurable module check failed for InputfieldSelector, retrying...
Modules: Configurable module check failed for ProcessPageSearch, retrying...

Problem solved: Divergence in database settings in $config (using 2 different installation dev/master).
Apart from this I would expect another Error message in this case.

Edited October 24, 2015 by kixe