Gerber Files add project name

When I create the gerber file it prepends the project name to the files for instance the front copper is RF Amplifier-F_Cu.gbr how to i plot it without the RF Amplifier- being added because if I dont remove this JCB says I have incorrect gerber files.

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are you leaving space in the name?

I use it like this, and I have had no problems

The Gerber spec is silent in the file name. I believe it is more JCB having incorrect software.