lovely compiler error message - incompatible types

[Laeeth Isharc via Digitalmars-d-learn]

Hi.

It's not easy to reduce, but I will have a go if other options 
fail.

Any thoughts on what could be leading to the following:
./../../marketdata/source/pricebar.d(397): Error: incompatible 
types for ((bar.high) + (bar.low)): 'FixedDecimal!(int, 8)' and 
'FixedDecimal!(int, 8)'
../../../marketdata/source/pricebar.d(399): Error: incompatible 
types for ((bar.high) + (bar.low)): 'FixedDecimal!(int, 8)' and 
'FixedDecimal!(int, 8)'
../../../marketdata/source/pricebar.d(547): Error: incompatible 
types for ((trueHigh(bars)) - (trueLow(bars))): 
'FixedDecimal!(int, 8)' and 'FixedDecimal!(int, 8)'

FixedDecimal is a fixed decimal point struct that stores values 
as an int or long and takes number of decimal places as the 
second compile term argument.  It's possible, if not likely I 
have made a mistake in implementing operator overloads.

Any thoughts on whether this is the likely cause, and if so which 
ones are likely to be the problem?

Thanks.


Laeeth.