Your working from the bio4trial right? the cal error is common, happens only with the trial though, can't say why. But the benefit is that it does not suffer from the pixal shader problem RE4 does. This makes the trial more versitle then RE4. The only problem is bio4trial is a DEMO. Therefore there is no point in playing it really, besides playing with the debug menu. Actually this is the only way you can actually play this game, is to switch on the debug menu with GC-Tool. It will then appear at the title screen, and you can select you spawn point, what it does is skip the intro. You'll spawn somewhere else...
Of course there are problems, cause its a demo, map files are missing, so be careful on what stage you pick.. 1 or 2 ususally takes near the beginnning. Hope you keep trying.. if i can do it, so should you.