uVision is simply an interface;
You must write your code in either Assembler or C, and use either the Assembler (A51.exe) or Compiler (C51.exe) to translate it.
Consult the Keil documentation to discover their reserved symbols!

What are you trying to use '*' for - it's highly unlikely to be available as a symbol name, or even within a symbol name (in C, it's the pointer dereference operator and the multiplication operator).

BTW: any particular reason for uVision51 - that's waaaaaaaaaay out of date!