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You import OBJs in the Form plugin, not in the project panel.
What is your specific workflow? If you are using Trapcode Form you must have the TrapcodeObj plug-in installed in the Plug-ins/Format folder. Check that. With the plug-in istalled, which the trapcode installer is supposed to do, you can import OBJ's using the sandard import methods.
Here's what a Google search of your problem pulls up.
Thank you so much , I have found where the problem lies.
As you said, I checked the TrapcodeObj plug-in in the Plug-ins/Format folder,TrapcodeObj doesn't exist.Now I have get the problem thoroughly solved.I am not the people of English-speaking country,and my English is poor,I may express the problem not clear in some aspects.Thank you for your answer with patience,and thank you for your help from thousands kilometers away.
Thanks a lot ,now I have solved it