sensel morph; calling C library

I am trying to connect the Sensel Morph touch sensitive keypad to Matlab. The library contains the following definitions:

typedef struct
  {
    unsigned char idx;                 // ID of the sensor
    unsigned char serial_num[64];      // Serial number of the sensor
    unsigned char com_port[64];        // Com port associated with the sensor
  } SenselDeviceID;
  typedef struct
  {
    unsigned char  num_devices;                 // Num of devices found
    SenselDeviceID devices[SENSEL_MAX_DEVICES]; // Sensel device ID details
  } SenselDeviceList;

When the compiled library is loaded into matlab, it gives the following warning:

The data type 'SenselDeviceID#16' used by structure SenselDeviceList does not exist.

'SENSEL_MAX_DEVICES' is set to be 16. if I change it to some other number then the number following the # in the warning changes with it. It is as if some process is changing ' devices' to '#'

so a) can anyone shed any light on what might be happening here?

or b) has anyone else managed to link matlab to the Sensel?