That has nothing whatsoever to do with additional toolboxes -- that says you've left out one or more required arguments to the particular function you've tried to call -- but, we've no way to guess which one that might be.
Attach the complete error message and somebody will be able to help, but without we're totally in the dark...
>> mean()
Not enough input arguments.
Error in mean (line 74)
[flag, omitnan] = parseInputs(flag, flag2, isFlag2Set);
>>
You can create the error with the most mundane of functions just by not supplying an input... mean must have at least one; how many are needed is all dependent upon which function you're using that gave the error...
