AQTime displays this message if an error occurs when you start profiling in 
Service mode. Typically, this happens when the AQTime Service is not running. AQTime requires that this service be running in order to profile your service application.
You can start the AQTime Service via the Control Panel > Administrator Tools > Services dialog:
Alternatively, you can start the service by running <AQTime>\Bin\DebugService8x86.exe (on 32-bit operating systems) or <AQTime>\x64\Bin\DebugService8x64.exe (on 64-bit systems) with the -service argument in its command line:
<AQTime>\Bin\DebuggerService8x86.exe -service<AQTime>\x64\Bin\DebuggerService8x64.exe -service
If this does not help, please reinstall AQTime.