Error C129

Well - if it's missing, then you won't find it!

;-)

Seriously, though, this is often the result of some other error where the only way the compiler can see to get back "in-sync" with your source text is by assuming that there should've been a semicolon at the point indicated.

Are there any other errors preceding this?

In particular, look out for undefined symbols, type names, and preprocessor macros...

C:\KEIL\C51\INC\REG51.H

In that location, I would expect that to be one of Keil's supplied headers - is it?
If it is, have you messed with it?

C:\KEIL\C51\INC\REG51.H(13)

That's pretty early in the file (line 13) - could it, perchance, be the first non-comment line after the header comment?
If it is, the error may be immediately before the #include line for this header...

Well - if it's missing, then you won't find it!

;-)

Seriously, though, this is often the result of some other error where the only way the compiler can see to get back "in-sync" with your source text is by assuming that there should've been a semicolon at the point indicated.

Are there any other errors preceding this?

In particular, look out for undefined symbols, type names, and preprocessor macros...

C:\KEIL\C51\INC\REG51.H

In that location, I would expect that to be one of Keil's supplied headers - is it?
If it is, have you messed with it?

C:\KEIL\C51\INC\REG51.H(13)

That's pretty early in the file (line 13) - could it, perchance, be the first non-comment line after the header comment?
If it is, the error may be immediately before the #include line for this header...

could it, perchance, be the first non-comment line after the header comment?
when I lose a few of the strands of the hair I have left hunting for something like this, it is often because the cause is in the preceding included file.

Erik