error 18 on most functions that are properly formatted??

So, I am new to Keil. I am porting a project in and building to find errors.

I get multiple error 18's insisting a ")" is expected on a simple line that is perfectly legitimate c syntax. Such as this function:

uint8_t si_rd_user()
{ uint8_t value; twi_write(SI_ADDR, SI_READ_USER_REGISTER); value = twi_read(SI_ADDR); return(value);
}

The twi_write line is errored, but it certainly does not need any further parens
Oddly, the line is not x'd as an error.

What is going on here. Can anyone help with this?

Thanks
Robin@TL