It sounds like you are trying to run a frequency that is too low for Spooky2 Central to handle. Please do the following steps:
1. Make sure you are running the latest version of Spooky2 from spooky2.com.
2. Select the Spooky Central preset from within Spooky2.
3. Choose the programs you wish to run.
4. Select a generator to run and run the program.
Do not forget to "Overwrite Generator" before selecting your generator.