DYnamic linker cann't find MotorIOLib_ThreadIsRunning()

[CvanLeeuwenFt]

I was using MotorIOLib_ThreadIsRunning in an older SLI.
I tried to use this SLI with firmware 4.6.6. and 4.7.0..
The SLI is compiling fine but at runtime I receive a message that the MotorIOLib_ThreadIsRunning can't be resolved.

if( ! MotorIOLib_ThreadIsRunning()){
fprintf(stderr, "SliDemo2.setJoystickMotorsShort: Motor IO lib thread is not running!\n");
return -3;
}