No logos with custom common.lvl

[Giftheck]

I've noticed that if I build a custom common.lvl, the splash logos that appear before the main menu of the game do not appear and I get this error in BFront.txt:

Code Select Expand

Message Severity: 2
D:\src\FRONTLINE_PC\FrontLine\Source\FLEffect.cpp(180)
FLEffect::Read: duplicate effect class name (04a25e84)!

The error occurs even if I do not create custom versions of those splash images. Why does this happen and how can I fix it?