Why am I getting the Error (-2)?

The Error (-2) indicates that there were not any bytes available to read from the serial communication stream. Often, this can be translated to the situation in which another application is currently open and connected to the MindSet. The MindSet can only connect to a single application at a time.

To fix the problem, first un-pair all other Bluetooth devices currently paired to your computer. Next, turn off any other computers you may have used with the MindSet, as they may still be connected to it. Last, restart your computer, which should close any currently open connections with the MindSet.