First of all, I'm not using any hack or mod. after I installed nightlife expansion. I encounter problems for nightlife expansion's objects such as in the picture below. I have original sims2 and university installed before I install nightlife. not ALL the nightlife objects face such problem though, but mostly(90%). and I didn't receive any error message.
Any idea on how to fix this? Sofa, Car that came with nightlife exp, the waiter and waitress clothes, the cooking cooktop etc... However, All my custom content are fine

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