[TDK1044]

Originally Posted by Kapteeni Rantala

Real Fleet Boat v1.27 (installed this first before anything else)
Tougher Aircraft
Just More Ammo
Browning .50 Machine Gun v1.1a
Officer Rank Insignia 1.1
Ultimate Soundmod
Spax's Run Silent Run Deep SH4 Sound Mod
Fleet carrier Kaga
SUPER_SHIP_POWER_PACK.rar

And from here: http://www.subsim.com/subsim_files/patches2005.html
Small Radar Contacts Mod
ParaB's Fewer Radio Contacts
2RTR US Periscope v1.1 (2.2MB)
Dark background for Recognition Manual
Pampanito Helm Bar
JP Ship Dimension Fix 1.0
CAPTAIN MIDNIGHT'S CBS RADIO MOD FOR SH4 by CaptainCox (146MB)
Mini-chronometer
jimimadrid's SH4 BRASS HUD

I also installed some skins for the submarines but I can't see how those could cause the problem.

That's it.

My guess would be the mini chronometer. Uninstall that and see if the error goes away.