Can't connect to Kdb using Datafeed toolbox

I tried connecting to Kdb via the Datafeed toolbox but this is the error that I get:

"Undefined function 'c' for input arguments of type 'char'.

Error in kx (line 63)

Error in KdbTest (line 10) k = kx(host, port);"

I've already added the jdbc.jar via the javaaddpath call. I am currently using MATLAB 2014a x64 and the latest version of jdbc.jar from http://kx.com/q/c/.

One strange thing I noticed (not sure if it's related to this issue) is that my kx function is empty, i.e., it only contains comments but no body. All other kx functions (fetch, get, etc...) are not empty.

[Dave]

I realized that when I use k = kx.c(host, port), the connection works and gives an answer of

kx.c@3dcc874a

But then doing fetch(k, '.z.p') gives the following error:

"Undefined function 'fetch' for input arguments of type 'kx.c'."

Anyone having ideas on how to proceed?