[1.12] countif(range, expression) unimplemented

[bat guano don blech e4ward com]

Hi,

trying to count all occurences of "x" in a line, I chose from the
function-dropdown "mathematics", then countif and completed the formula
=countif(c3:c9;"x")
The result is an error "function implementation unavailable". The
message is translated from the German locale that I use but should be
all in all identic in English.

I do not ask for a fix, as I am quicker writing the missing function in
Python. ;-)

Cheerio,

Michael.