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when i want to build a project the uvision halts.

hi,
recently i instaled uvision 2.38 on my computer.but when i want to build and compile a project the uvision halts .
when i erase the "#include <reg51.h>" command
the uvision don't stop but i get the "error C202: 'TH1': undefined identifier" error message"
please tell me what is the problem.
i must say that i don't have the problem with the previous versions"
thanks very much.